JP2006195901A - Semiconductor device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a memory card with a contactless communication function which can perform contactless communication stably in any power supply state of a power source for a memory card, in the memory card with the contactless communication function having a plurality of interfaces such as a communication circuit for a memory card of a usual memory card, a contactless communication circuit, and the like. <P>SOLUTION: A system selection circuit 109 selects a system from systems stored in a system storing section 108 based on the detection result of a power source voltage sensor 106 for a memory card and a contactless communication power source voltage sensor 107. A VCO 110 is controlled in oscillation and stop according to the selected system. A clock selection/reset generation circuit 111 generates reset according to the selected system to each of a CPU 114, a flash controller 113 and an encryption circuit 112 for contactless communication and selects either of a clock supplied from the contactless communication circuit 105 or a clock supplied from the VCO 110. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a semiconductor device, and more particularly to a non-contact IC card. In addition to a non-contact communication circuit, a non-contact communication is provided by providing a plurality of interfaces such as a wired memory card communication circuit of a normal memory card. It relates to the improvement of the memory card with function.

  In recent years, in addition to railway / transportation applications, contactless IC cards based on contactless communication technology have been widely used in electronic money, electronic tickets, membership cards, ticket gates for public transportation, payment at cash registers, and the like. A non-contact IC card can be authenticated and settled by non-contact communication (wireless communication) simply by holding or touching the card reader without taking out the card from a wallet, pass case or the like (see, for example, Patent Document 1). There are card shapes, cartridge shapes, and device shapes.

The card shape is a non-contact IC card itself. The cartridge shape is an LSI cartridge for a non-contact IC card and is mounted in another device. The device shape is the case of a device itself such as a mobile phone with a non-contact IC card function in which an antenna is embedded in a mobile phone.
By the way, the non-contact IC card has drawbacks such as a small data capacity and a card shape, which requires a dedicated terminal for data access to the inside of the card and is not convenient.
On the other hand, the mobile phone with a non-contact IC card function has an advantage that information inside the card, which has been a drawback of the non-contact IC card, can be called on the mobile phone screen. On the other hand, there is a problem that contactless communication cannot be performed while accessing the card internal information, and contactless communication cannot be performed without power supply from the mobile phone.

On the other hand, there is a form of a memory card equipped with a non-contact IC card function. This memory card operates alone as a non-contact IC card, and the large-capacity flash memory of the memory card can be used. In addition, since the data inside the card can be accessed by a device to which the memory card is attached, such as a mobile phone, the disadvantages of the conventional contactless IC card can be solved.
Japanese Patent Laying-Open No. 2003-36427 (page 4, FIGS. 1 and 2)

In this way, by adopting non-contact communication, it is possible to read and write the contents of the card simply by bringing the card close to the reader or writer or touching it lightly, and the card is loaded into the slot of the reader or writer whenever it is read or written. The trouble of inserting can be saved.
However, in the case of non-contact communication, not only data but also the power and clock of the memory card are transmitted / received by radio waves, so that the operation becomes unstable if the approach is insufficient or the radio wave condition is bad. In addition, the power supply state of the memory card and the clock supply state change independently of non-contact communication, such as the power supply being stopped when there is no access from the host. It was difficult.

  The present invention has been made to solve the above-described conventional problems, and in a memory card having a non-contact communication function, stable communication is possible regardless of the state of communication from the host device. An object of the present invention is to provide a possible semiconductor device.

  A semiconductor device according to claim 1 of the present application is a card-type semiconductor device, which receives power supply from the outside by contact communication and transmits / receives data, and the first communication unit. A first power supply state detection unit that detects a state of power supplied by contact communication and a contactless communication unit that receives power and clock signals from the outside through contactless communication and transmits / receives data A second power supply state detection unit for detecting a state of power supplied from the second communication unit supplied by non-contact communication, and a method for controlling a clock signal and a reset signal according to the state of power supply A method storage unit storing a plurality of (hereinafter referred to as methods), and a plurality of items stored in the method storage unit according to detection results of the first power supply state detection unit and the second power supply state detection unit One of the methods A method selection unit for selecting a signal, an oscillation unit for receiving a power supply from the contact communication unit and oscillating a clock signal, a clock signal supplied from the second communication unit according to a method selected by the method selection unit, and the A clock selection / reset generation unit that selects any one of the clock signals supplied from the oscillation unit and generates a reset signal is provided.

  The semiconductor device according to the invention of claim 2 of the present application receives a power supply from outside by contact communication and transmits and receives data, and supplies power and a clock signal from outside by non-contact communication. A contactless communication unit that receives and transmits / receives data, an oscillation unit that receives power from the contact communication unit and oscillates a clock signal, and when the contact communication and the contactless communication are performed simultaneously, the contactless communication unit And a clock signal selection unit for selecting one of the clock signals supplied from the oscillation unit.

  Further, a semiconductor device according to the invention of claim 3 of the present application is a card type semiconductor device with a non-contact communication function, a memory card communication circuit which receives power supply from the outside by contact communication and transmits / receives data; A power supply voltage sensor for the memory card that detects the state of the power supply for the memory card output from the communication circuit for the memory card, and a contactless transmission / reception of data by receiving power and clock signals from the outside through contactless communication A communication circuit, a non-contact power supply voltage sensor that detects the state of a non-contact communication power source output from the non-contact communication circuit, and a plurality of system information about supply of a clock signal and a reset signal according to a power supply state are stored. From the method storage unit, the detection result of the power supply voltage sensor for the memory card, and the detection result of the non-contact power supply voltage sensor, the method A method selection circuit for selecting one of the method information stored in the storage unit, a VCO that receives power from the memory card communication circuit and oscillates a clock signal, a CPU that performs various arithmetic processes, According to the flash controller controlled by the CPU, the flash memory that exchanges data with the flash controller, the encryption circuit for contactless communication that performs encryption processing during contactless communication, and the method information selected by the method selection circuit, For each of the CPU, the flash controller, and the encryption circuit for non-contact communication, a clock signal supplied from the non-contact communication circuit or a clock signal supplied from the VCO is selected, and each of the above-mentioned A clock selection / reset generation circuit that generates a reset signal to be input to the circuit. The one in which the features.

  According to a fourth aspect of the present invention, there is provided a semiconductor device according to the third aspect, wherein the bit expansion unit for applying an expansion bit according to a transition between the power state for the memory card and the non-contact communication power state is provided. Further, the method selection circuit is characterized in that when selecting an optimum method based on the transition of the power supply state, the selection is performed in consideration of the extension bits.

  According to a fifth aspect of the present invention, there is provided a semiconductor device according to the fourth aspect, further comprising: a first ROM that stores extension bit assignment information indicating a method of assigning the extension bit. The expansion unit requests loading of information stored in the first ROM when at least one of the memory card power supply and the non-contact communication power supply is supplied.

  The semiconductor device according to claim 6 of the present application is the semiconductor device according to claim 4, further comprising a nonvolatile memory storing extension bit grant information indicating a method of granting the extension bit, and the extension The unit requests loading of information stored in the nonvolatile memory when at least one of the power supply for the memory card and the non-contact communication power supply is supplied.

  Further, in the semiconductor device according to claim 7 of the present application, in the semiconductor device according to claim 4, the extension bit grant information for receiving the extension bit grant information indicating the extension bit grant method by external communication. A communication circuit is further provided, and the extension bit grant information communication circuit is characterized in that the extension bit grant information is loaded into the extension unit when communication from the outside is detected.

  The semiconductor device according to an eighth aspect of the present invention is the semiconductor device according to the sixth aspect, further comprising a timer for measuring a supply time of either the memory card power source or the non-contact communication power source. The extension unit determines information to be loaded into the extension unit from the extension bit grant information stored in the nonvolatile memory in accordance with the supply time information from the timer.

  According to a ninth aspect of the present invention, there is provided a semiconductor device according to the eighth aspect, wherein a learning device that learns a power supply state that frequently occurs from a power supply state and supply time information from the timer is provided. Further, the learning device is characterized in that information to be loaded into the extension unit is determined from the extension bit assignment information stored in the nonvolatile memory according to the learned content.

  A semiconductor device according to claim 10 of the present application is the semiconductor device according to claim 8, further comprising a fraud pattern collator that monitors a power state transition pattern and collates it with a fraud pattern. The CPU is notified of whether or not the transition corresponds to an illegal pattern.

  Further, a semiconductor device according to an invention of claim 11 of the present application further includes a second ROM that stores method information other than the method information stored in the method storage unit in the semiconductor device according to claim 3, The method storage unit loads the method information stored in the second ROM into the method storage unit.

  A semiconductor device according to a twelfth aspect of the present invention is the semiconductor device according to the third aspect, wherein when the power supply state is monitored and it is determined that a power supply for the memory card is necessary, power is supplied to the communication circuit for the memory card. A power supply requesting unit that requests supply is further provided.

  According to the first aspect of the present invention, in the card-type semiconductor device, the contact communication unit that receives power supply from the outside by contact communication and the contactless communication that receives the power supply and clock signal from the outside by contactless communication. By detecting the power supply state, it is possible to select either the clock signal from the outside or the clock signal oscillated internally by the power supplied from the outside. There is an effect that a stable clock signal or reset signal can be used according to the use situation.

  According to the invention of claim 2 of the present application, in the card-type semiconductor device, the contact communication unit that receives power supply from outside by contact communication and the non-contact communication that receives power supply and clock signal from outside. Since it has a contact communication unit, and by detecting the power supply state, it is possible to select which of the clock signal from the outside or the clock signal oscillated internally by the power supplied from the outside is used. There is an effect that a stable clock signal can be used according to the use situation of the card.

  According to the invention of claim 3 of the present application, the memory card with a non-contact function includes a memory card controller, a coil antenna, and a flash memory, and the memory card controller includes a memory card communication circuit, Contact communication circuit, memory card power supply voltage sensor, contactless communication power supply voltage sensor, method storage unit, method selection circuit, VCO, clock selection / reset generation circuit, contactless communication encryption circuit, It has a flash controller and a CPU, and the method selection circuit selects one of the methods stored in the method storage unit according to the detection result of the memory card power supply voltage sensor and the non-contact communication power supply voltage sensor. To do. The VCO is controlled to oscillate and stop according to the selected method. The clock selection / reset generation circuit generates a reset signal for each of the CPU, the flash controller, and the contactless communication encryption circuit according to the selected method, and a clock signal supplied from the contactless communication circuit and a clock supplied from the VCO. Since any one of the signals is selected, the memory card with the non-contact function can be used even if the power supply for the memory card is started / stopped in the state where the non-contact communication power is supplied. Since a stable clock signal and reset signal are always supplied to the controller and the non-contact communication encryption circuit, there is an effect that stable non-contact communication is possible.

  According to a fourth aspect of the present invention, in the semiconductor device according to the third aspect, the memory card with a non-contact function further includes an expansion unit, and the expansion unit is in contact with the power supply state for the memory card and non-contact communication. An extension bit is assigned according to the transition of the power supply state, and the method selection circuit selects the optimum method based on the transition of the power state, so that the extension bit is also taken into consideration. It is possible to control the clock signal and the reset signal by selecting an optimum method according to the state transition, and there is an effect that stable communication is possible.

  According to the invention of claim 5 of the present application, in the semiconductor device according to claim 4, the memory card with a non-contact function further includes a ROM storing a method of providing an extension bit of the extension unit, The extension bit assignment method is stored, and the extension bit assignment method is loaded to the extension unit in response to a load request from the extension unit. It is possible to control the clock signal and the reset signal more flexibly according to the transition of the signal, and there is an effect that stable communication is possible.

  According to claim 6 of the present application, in the semiconductor device according to claim 4, the memory card with a non-contact function further includes a nonvolatile memory storing a method of providing an extension bit of the extension unit, The nonvolatile memory can be rewritten at any time by the CPU, and in response to a load request from the extension unit, the extension bit assignment method is loaded into the extension unit. By changing the method of applying the stored extension bit, it is possible to control the clock signal and the reset signal more flexibly according to the transition of the power supply state by rewriting the data in the nonvolatile memory, There is an effect of enabling stable communication.

  According to claim 7 of the present application, in the semiconductor device according to claim 4, the memory card with a non-contact function receives a method of providing an extension bit from an external communication and loads it to the extension unit. Thus, it is possible to change the method selection method to an arbitrary one according to the power supply state from the external device, and there is an effect that stable communication is possible.

  According to the semiconductor device of claim 8 of the present application, in the semiconductor device according to claim 6, the memory card with a non-contact function further includes a timer, and the timer measures the duration of the power supply state. Since the clock signal and the reset signal can be controlled more flexibly, the selection method of the optimum method can be arbitrarily changed according to the length of time that power is supplied, The clock signal and the reset signal can be controlled flexibly, and there is an effect that stable communication is possible.

  According to the semiconductor device of claim 9 of the present application, in the semiconductor device according to claim 8, the memory card with a non-contact function further includes a learning device, and the learning device includes a power supply state and a timer. Since the power supply status that occurs frequently is learned from the time information from the time, it is possible to learn the conditions frequently used by the user and change to the method of selecting the optimal method, more flexible clock The signal and the reset signal can be controlled, and there is an effect that stable communication is possible.

  According to the semiconductor device of the invention of claim 10 of the present application, in the semiconductor device according to claim 8, the memory card with a non-contact function further includes an illegal pattern collator, Compare the stored power supply status fraud pattern with the actual power supply status, and if it matches, the fraud information is output to the CPU. When it can be regarded as a fraudulent act and its preliminary act, the CPU can carry out a fraud countermeasure process, so that there is an effect that not only stable communication can be performed but also a safe measure can be obtained.

  According to the semiconductor device of claim 11 of the present application, in the semiconductor device according to claim 3, the memory card with a non-contact function further includes a ROM storing a method, and the ROM is in a power supply state. In response to a load request from the method storage unit, the stored method is loaded into the method, so that the method information stored in the method storage unit itself can be replaced. As a result, the clock signal and the reset signal can be controlled more flexibly, and stable communication is possible.

  According to a semiconductor device of a twelfth aspect of the present invention, in the semiconductor device according to the third aspect, the memory card with a non-contact function further includes a power request unit, and the power request unit is in a power supply state. The power request signal is output to the memory card communication circuit when it is determined that a power supply for the memory card is necessary. By issuing the power request signal, the power supply in the non-contact communication signal is output. There is an effect that supply is stable and more stable communication is possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.
(Embodiment 1)
<Overall configuration of memory card with contactless communication function>
1 is a block diagram showing an overall configuration of a memory card with a non-contact communication function as a semiconductor device according to a first embodiment of the present invention.
FIG. 2 shows the entire power supply system and data flow, some of which are omitted in FIG.

The memory card with a non-contact communication function according to the configuration of FIG. 1 is provided with a non-contact communication circuit for non-contact communication and a memory card communication circuit for contact communication.
As a usage pattern of the memory card corresponding to both the non-contact communication and the contact communication, a situation as shown in FIG. 3 is assumed.

In the situation shown in FIG. 3, for example, a memory card 100 with a non-contact communication function is inserted into a slot SLT of a digital device such as a PDA (Personal Digital Assistant), a portable audio device, or a mobile phone MP, and the digital device is contacted. Data is exchanged with the memory card with communication function. This exchange is performed by contact communication.
Further, for example, the memory card 100 with a non-contact communication function installed in the slot of such a digital device is used as a radio wave of a non-contact communication host device such as a railway automatic ticket gate ATG / shop service point (so-called point) card reader / writer. When approaching or touching within the reachable range, data is exchanged between the non-contact communication host device and a memory card with a non-contact communication function. This exchange is performed by non-contact communication.

<Memory card with non-contact communication function>
In FIG. 1, the memory card 100 with a non-contact communication function includes a memory card controller 101, a coil antenna 102, and a flash memory 103.
The memory card controller 101 corresponds to a one-chip microcomputer, and includes a memory card communication circuit (contact communication unit) 104, a non-contact communication circuit (non-contact communication unit) 105, and a memory card power supply voltage sensor (first Power supply state detection unit) 106, non-contact power supply voltage sensor (second power supply state detection unit) 107, method storage unit 108, method selection circuit (method selection unit) 109, VCO (oscillation unit) 110, A clock selection / reset generation circuit (clock selection / reset generation unit, clock selection unit) 111, a non-contact communication encryption circuit 112, a flash controller 113, and a CPU 114.

  The memory card communication circuit 104 outputs, to the memory card power supply voltage sensor 106, a memory card power supply 115 that is supplied in a wired manner from a digital device (not shown) as a memory card power supply voltage 116. The memory card data 117 received from the digital device is output to the CPU 114, and the memory card data 117 output from the CPU 114 is transmitted to the digital device.

  The non-contact communication circuit 105 outputs the non-contact communication power supply 118 supplied by electromagnetic induction from the non-contact communication host device via the coil antenna 102 to the non-contact power supply voltage sensor 107 as a non-contact power supply voltage 119.

  Further, the non-contact communication clock (clock signal) 120 supplied from the non-contact communication host device via the coil antenna 102 is output to the clock selection / reset generation circuit (clock selection / reset generation unit) 111. Also, the non-contact communication data 121 received from the non-contact communication host device via the coil antenna 102 is output to the CPU 114, and the non-contact communication data 121 output from the CPU 114 is output to the non-contact communication host device via the coil antenna 102. Send.

  The memory card power supply voltage sensor 106 detects the memory card power supply voltage 116 supplied from the memory card communication circuit 104, and determines whether the memory card power supply 115 is not supplied or is supplied. This is output to the system selection circuit 109 as a voltage state signal 122 for use.

here,
a) When the memory card power supply 115 is supplied,
Memory card voltage state signal 122 = 1
b) When the memory card power supply 115 is not supplied,
Memory card voltage state signal 122 = 0
Is output.
The memory card voltage state signal 122 may be a plurality of signals.

The non-contact power supply voltage sensor 107 detects the non-contact power supply voltage 119 supplied from the non-contact communication circuit 105 and determines whether the non-contact communication power supply 118 is not supplied or is supplied. 123 is output to the method selection circuit 109.
here,
c) When the non-contact communication power supply 118 is supplied,
Non-contact voltage state signal 123 = 1
d) When the non-contact communication power supply 118 is not supplied,
Non-contact voltage state signal 123 = 0
Is output.
The non-contact voltage state signal 123 may be a plurality of signals.

  In the method storage unit 108, method information A indicating the clock of the VCO 110, the CPU 114, the flash controller 113, the non-contact communication encryption circuit 112, and the reset control method (so-called resource) according to the power supply state, Method information B and method information C (method A, method B, method C) are stored. Hereinafter, method information X is simply referred to as method X.

here,
α) As method A,
“When only the non-contact communication power supply 118 is supplied, that is, when the memory card voltage state signal 122 = 0 and the non-contact voltage state signal 123 = 1, the VCO 110 is stopped and the CPU 114 is used using the non-contact communication clock 120. And the non-contact communication encryption circuit 112 ”
β) As method B,
“When the non-contact communication power source 118 and the memory card power source 115 are supplied, that is, when the memory card voltage state signal 122 = 1 and the non-contact voltage state signal 123 = 1, the VCO 110 is oscillated and the VCO clock 124 The CPU 114, the flash controller 113, and the non-contact communication encryption circuit 112 are operated using the "
γ) As method C,
“When only the memory card power supply 115 is supplied, that is, when the memory card voltage state signal 122 = 1 and the non-contact voltage state signal 123 = 0, the VCO 110 is oscillated and flashed with the CPU 114 using the VCO clock 124. Operate controller 113 "
Information to that effect is stored.

  The method selection circuit 109 stores the method information corresponding to the current power supply state stored in the method storage unit 108 according to the power supply state represented by the memory card voltage state signal 122 and the non-contact voltage state signal 123. The selected method signal 125 is output to the VCO 110 and the clock selection / reset generation circuit 111. That is, the memory card voltage state signal 122 indicates “the state where the memory card power source 115 is not supplied”, and the non-contact voltage state signal 123 indicates “the state where the non-contact communication power source 118 is supplied”. In this case, the method selection circuit 109 selects the method A and outputs a method signal 125 indicating a request “stop the VCO 110 and operate the CPU 114 and the non-contact communication encryption circuit 112 using the non-contact communication clock 120”. The data is output to the VCO 110 and the clock selection / reset generation circuit 111.

  The VCO 110 oscillates or stops in response to the system signal 125 supplied from the system selection circuit 109, and outputs the VCO clock 124 to the clock selection / reset generation circuit 111 when oscillating. That is, when the method selection circuit 109 selects the method A, the method signal 125 indicates a “VCO 110 stop” request, and the VCO 110 does not oscillate.

  The clock selection / reset generation circuit 111 selects a clock signal (hereinafter referred to as a clock) and generates a reset signal (hereinafter referred to as a reset) in accordance with the system signal 125 supplied from the system selection circuit 109, and performs a CPU 114, a flash A clock and a reset are supplied to the controller 113 and the non-contact communication encryption circuit 112, respectively. Regarding the selection of the clock, either the VCO clock 124 supplied from the VCO 110 or the non-contact clock supplied from the non-contact communication circuit 105 is selected according to the system signal 125, and the CPU 114, the flash controller 113, and the non-contact communication are selected. The CPU clock 126, the flash controller clock 127, and the non-contact communication encryption circuit clock 128 are output to each of the encryption circuits 112. As for reset generation, the CPU 114, the flash controller 113, and the non-contact communication encryption circuit 112 are reset to the CPU 114, the flash controller 113, and the non-contact communication encryption circuit 112, respectively. The cryptographic circuit reset 131 is output.

  That is, when the method selection circuit 109 selects the method A, the method signal 125 indicates a request to “operate the CPU 114 and the non-contact communication encryption circuit 112 using the non-contact communication clock 120”, and the CPU reset 129. And the non-contact communication clock 120 is selected and output to the CPU clock 126. Further, the non-contact communication encryption circuit reset 131 is canceled, and the non-contact communication clock 120 is selected and output to the non-contact communication encryption circuit clock 128. Further, the flash controller reset 130 is not canceled and no clock is supplied. As a result, the CPU 114 is operated by the CPU clock 126 and the CPU reset 129 given by the clock selection / reset generation circuit 111. The CPU 114 also exchanges the memory card data 117 with the memory card communication circuit 104. Further, the CPU 114 exchanges non-contact communication data 121 with the non-contact communication circuit 105. The CPU 114 also exchanges data with the flash memory 103 via the flash controller 113.

The flash controller 113 is operated by the flash controller clock 127 provided by the clock selection / reset generation circuit 111 and the flash controller reset 130. The flash controller 113 exchanges data between the CPU 114 and the flash memory 103.
The contactless communication encryption circuit 112 is operated by the contactless communication encryption circuit clock 128 and the contactless communication encryption circuit reset 131 provided by the clock selection / reset generation circuit 111.

<Flash memory>
The flash memory is controlled by the flash controller 113 and records and reads data.
<When only the non-contact communication power supply 118 is supplied>
First, the case where only the non-contact communication power supply 118 is supplied will be described. When the non-contact communication power supply 118 is supplied, the non-contact power supply voltage sensor 107 starts monitoring the non-contact power supply voltage 119 and sets the non-contact voltage state signal 123 as “a state where the non-contact communication power supply 118 is supplied”. = 1 is output.

  Since the memory card power supply voltage sensor 106 is not supplied with the memory card power supply 115, the memory card power supply voltage state signal = 0 is output as "the state where the memory card power supply 115 is not supplied". Since the non-contact voltage state signal 123 = 1 and the memory card voltage state signal 122 = 0, the method selection circuit 109 recognizes that “only the non-contact communication power supply 118 is supplied”. The method A corresponding to this state “stop the VCO 110 and operate the CPU 114 and the non-contact communication encryption circuit 112 using the non-contact communication clock 120” is selected from the method storage unit 108, and the VCO 110, The system signal 125 is output to the clock selection / reset generation circuit 111. The VCO 110 is controlled in oscillation by a method signal 125 based on the method A output from the method selection circuit 109.

  In the case of method A, the VCO 110 stops and does not output the VCO clock 124 to the clock selection / reset generation circuit 111. The clock selection / reset generation circuit 111 performs clock selection and reset generation based on the method signal 125 based on the method A output from the method selection circuit 109. In method A, the clock selection / reset generation circuit 111 selects the non-contact communication clock 120 as the CPU clock 126 for the CPU 114 and cancels the CPU reset 129. The clock selection / reset generation circuit 111 stops the flash controller clock 127 for the flash controller 113 and does not release the flash controller reset 130. The clock selection / reset generation circuit 111 selects the non-contact communication clock 120 as the non-contact communication encryption circuit clock 128 for the non-contact communication encryption circuit 112 and cancels the non-contact communication encryption circuit reset 131.

<When non-contact communication power supply 118 and memory card power supply 115 are supplied>
Next, the case where the non-contact communication power source 118 and the memory card power source 115 are supplied will be described.
When the non-contact communication power supply 118 is supplied, the non-contact power supply voltage sensor 107 starts monitoring the non-contact power supply voltage 119 and sets the non-contact voltage state signal 123 as “a state where the non-contact communication power supply 118 is supplied”. = 1 is output. When the memory card power supply voltage 115 is supplied, the memory card power supply voltage sensor 106 starts monitoring the memory card power supply voltage 116 and sets the memory card power supply voltage as “the state where the memory card power supply 115 is supplied”. A status signal 122 = 1 is output. Since the non-contact voltage state signal 123 = 1 and the memory card voltage state signal 122 = 1, the system selection circuit 109 is in a “state in which the non-contact communication power source 118 and the memory card power source 115 are supplied”. Recognize this, and select the method B “oscillate the VCO 110 and operate the CPU 114 and the flash controller 113 using the VCO clock 124” from the method storage unit 108 in accordance with this state. A method signal 125 is output to the selection / reset generation circuit 111.

  The VCO 110 is controlled in oscillation by a method signal 125 based on the method B output from the method selection circuit 109. In the case of method B, the VCO 110 oscillates and outputs the VCO clock 124 to the clock selection / reset generation circuit 111. The clock selection / reset generation circuit 111 performs clock selection and reset generation based on the method signal 125 based on the method B output from the method selection circuit 109. In method B, the clock selection / reset generation circuit 111 selects the clock of the VCO 110 as the CPU clock 126 for the CPU 114 and cancels the CPU reset 129. The clock selection / reset generation circuit 111 selects the VCO clock 124 as the flash controller clock 127 for the flash controller 113 and cancels the flash controller reset 130. The clock selection / reset generation circuit 111 selects the VCO clock 124 as the contactless communication encryption circuit clock 128 for the contactless communication encryption circuit 112 and cancels the contactless communication encryption circuit reset 131.

<When only the memory card power supply 115 is supplied>
Further, a case where only the memory card power supply 115 is supplied will be described. When the memory card power supply voltage 115 is supplied, the memory card power supply voltage sensor 106 starts monitoring the memory card power supply voltage 116 and sets the memory card power supply voltage as “the state where the memory card power supply 115 is supplied”. A status signal 122 = 1 is output.

  The non-contact power supply voltage sensor 107 outputs a non-contact power supply voltage state signal = 0 as “a state in which the non-contact communication power supply 118 is not supplied” because the non-contact communication power supply 118 is not supplied. Since the non-contact voltage state signal 123 = 0 and the memory card voltage state signal 122 = 1, the method selection circuit 109 recognizes that “only the power source 115 for the memory card is supplied”. The method C corresponding to this state “oscillate VCO 110 and operate CPU 114 and flash controller 113 using VCO clock 124” is selected from method storage unit 108, and VCO 110, clock selection / reset generation circuit according to method C The system signal 125 is output to 111. The VCO 110 is controlled in oscillation by a method signal 125 based on the method C output from the method selection circuit 109.

  In the case of method C, the VCO 110 oscillates and outputs the VCO clock 124 to the clock selection / reset generation circuit 111. The clock selection / reset generation circuit 111 performs clock selection and reset generation based on the method signal 125 based on the method C output from the method selection circuit 109. In method C, the clock selection / reset generation circuit 111 selects the VCO clock 124 as the CPU clock 126 for the CPU 114 and cancels the CPU reset 129. The clock selection / reset generation circuit 111 selects the VCO clock 124 as the flash controller clock 127 for the flash controller 113 and cancels the flash controller reset 130. The clock selection / reset generation circuit 111 stops the non-contact communication encryption circuit clock 128 for the non-contact communication encryption circuit 112 and does not release the non-contact communication encryption circuit reset 131.

  Accordingly, even when the supply of the memory card power supply 115 is started and stopped in a state where the contactless communication power supply 118 is supplied, the CPU 114, the flash controller 113, and the contactless communication encryption circuit 112 are always provided. Since a stable clock and reset signal are supplied, a memory card with a non-contact communication function capable of stable communication can be provided.

<Effect>
As described above, in the first embodiment, when only the non-contact communication power supply 118 is supplied, or when the non-contact communication power supply 118 and the memory card power supply 115 are supplied, only the memory card power supply 115 is used. Since a method corresponding to each state when it is supplied is prepared and these methods can be selected, the optimum clock reset control can be performed by setting each method to the optimum method for each state. There is a possible effect.

(Embodiment 2)
FIG. 4 is a block diagram showing the configuration of a memory card with a non-contact communication function according to Embodiment 2 of the present invention. This block diagram shows only the components newly provided for the memory card with the non-contact communication function shown in FIG. That is, FIG. 4 further includes an expansion unit 201 in addition to the memory card with a non-contact communication function shown in FIG. It should be noted that the block diagram showing the configuration in the third and subsequent embodiments also shows only the components newly provided for the memory card with the non-contact communication function shown in FIG. Further, the method storage unit 108 stores a method D, a method E, a method F, and a method G that partially perform the same processing as the method A, the method B, and the method C in FIG.

  The expansion unit 201 stores the transition of the power supply state based on the memory card voltage state signal 122 provided from the memory card power supply voltage sensor 106 and the non-contact voltage state signal 123 provided from the non-contact power supply voltage sensor 107. Depending on the transition pattern of the power supply state, the extension unit state signal 202 with different extension bits added is output to the method selection circuit 109.

here,
Extension unit status signal 202 [2: 0] =
[Voltage state signal 122 for memory card: non-contact voltage state signal 123: extension bit]
As
When the state where only the non-contact communication power supply 118 is supplied transitions to the state where both the non-contact communication power supply 118 and the memory card power supply 115 are supplied,
That is, the voltage state signal 122 for the memory card and the non-contact voltage state signal 123 = 1
From the power supply state of
Memory card voltage state signal 122 = 1 and non-contact voltage state signal 123 = 1
When transitioning to
The extension state signal 202 = 110 (ie, the extension bit is 0),
When the state where only the memory card power supply 115 is supplied transitions to the state where both the non-contact communication power supply 118 and the memory card power supply 115 are supplied,
That is, the voltage state signal 122 for the memory card and the non-contact voltage state signal 123 = 0
From the power supply state of
Memory card voltage state signal 122 = 1 and non-contact voltage state signal 123 = 1
When transitioning to
The extension part status signal 202 = 111 (that is, the extension bit is 1),
Output each.

The extension bit is always 0 in transition patterns other than the above.
The method storage unit 108 stores the VCO 110, CPU 114, flash controller 113, non-contact communication encryption circuit clock 128, and method D, method E, method F, and method G that are reset control methods.

here,
In the method D, “when only the non-contact communication power supply 118 is supplied, that is, when the extension unit state signal 202 = 010,
The VCO 110 is stopped, and the CPU 114 and the non-contact communication encryption circuit 112 are operated using the non-contact communication clock 120. "
In the system E, “when the state where only the non-contact communication power supply 118 is supplied is changed to the state where the non-contact communication power supply 118 and the memory card power supply 115 are supplied, that is, the expansion unit state signal 202 = 110. In this case, the VCO 110 is stopped and the CPU 114 and the non-contact communication encryption circuit 112 are operated using the non-contact communication clock 120. "
In the system F, “when only the memory card power supply 115 is supplied is changed to the state where the non-contact communication power supply 118 and the memory card power supply 115 are supplied, that is, the expansion unit state signal 202 = 111. In this case, the VCO 110 is oscillated, and the CPU 114, the flash controller 113, and the non-contact communication encryption circuit 112 are operated using the VCO clock 124. "
In the system G, “when only the memory card power supply 115 is supplied, that is, the expansion unit state signal 202 = 100, the VCO 110 is oscillated, and the CPU 114 and the flash controller 113 are operated using the VCO clock 124”.
Is stored.
In addition to these, more methods may be stored.

Hereinafter, the operation in each of the above methods will be described.
Since method D and method G are the same as method A and method C in the first embodiment, description thereof is omitted.

<Method E: When the state where the non-contact communication power source 118 is first supplied is changed to the state where the non-contact communication power source 118 and the memory card power source 115 are supplied>
First, when only the non-contact communication power supply 118 is supplied, the non-contact power supply voltage sensor 107 starts monitoring the non-contact power supply voltage 119 when the non-contact communication power supply 118 is supplied. The signal 123 = 1 is output. The memory card power supply voltage sensor 106 outputs a memory card power supply voltage state signal = 0 because the memory card power supply 115 is not supplied. Since the state of the non-contact voltage state signal 123 = 1 and the memory card voltage state signal 122 = 0 has not changed, the expansion unit 201 sets expansion bit = 0, and the expansion unit state signal 202 = 010 is output. Since the extension unit state signal 202 = 010, the method selection circuit 109 selects the method D that matches this state from the method storage unit 108, and sends the method to the VCO 110 and the clock selection / reset generation circuit 111 according to the method D. The signal 125 is output. The VCO 110 and the clock selection / reset generation circuit 111 are controlled by a system signal 125 based on the system D output from the system selection circuit 109. That is, the VCO 110 is stopped, and the CPU 114 and the non-contact communication encryption circuit 112 are operated using the non-contact communication clock 120.

Next, it is assumed that the state is changed to a state where the non-contact communication power source 118 and the memory card power source 115 are supplied.
When the non-contact power supply voltage 118 is supplied, the non-contact power source voltage sensor 107 starts monitoring the non-contact power source voltage 119 and outputs a non-contact voltage state signal 123 = 1. When the memory card communication power is supplied, the memory card power supply voltage sensor 106 starts monitoring the memory card power supply voltage 116 and outputs a memory card voltage state signal 122 = 1. Since the expansion unit 201 transitions from the state of the non-contact voltage state signal 123 = 1 and the memory card voltage state signal 122 = 0 to the state of the non-contact voltage state signal 123 = 1 and the memory card voltage state signal 122 = 1, The extension bit = 0 is set, and the extension unit state signal 202 = 110 is output to the method selection circuit 109. Since the extension unit state signal 202 = 110, the method selection circuit 109 selects the method E that matches this state from the method storage unit 108, and the method is supplied to the VCO 110 and the clock selection / reset generation circuit 111 according to the method E. The signal 125 is output. The VCO 110 and the clock selection / reset generation circuit 111 are controlled by a system signal 125 based on the system E output from the system selection circuit 109. That is, the VCO 110 is stopped and the CPU 114 and the non-contact communication encryption circuit 112 are operated using the non-contact communication clock 120.

<Method F: When a transition is made from the state in which the memory card power source 115 is first supplied to the state in which the non-contact communication power source 118 and the memory card power source 115 are supplied>
First, the contactless power supply voltage sensor 107 outputs a contactless power supply voltage state signal = 0 because the contactless power supply 118 is not supplied in a state where only the memory card power supply 115 is supplied. When the memory card power supply 115 is supplied, the memory card power supply voltage sensor 106 starts monitoring the memory card power supply voltage 116 and outputs a memory card voltage state signal 122 = 1. Since the state of the non-contact voltage state signal 123 = 0 and the memory card voltage state signal 122 = 1 has not changed, the expansion unit 201 sets expansion bit = 0, and the expansion unit state signal 202 = 100 is output. Since the extension unit state signal 202 = 100, the method selection circuit 109 selects the method G that matches this state from the method storage unit 108 and supplies the method to the VCO 110 and the clock selection / reset generation circuit 111 according to the method G. The signal 125 is output. That is, the VCO 110 is oscillated, and the CPU 114 and the flash controller 113 are operated using the VCO clock 124. The VCO 110 and the clock selection / reset generation circuit 111 are controlled by a method signal 125 based on the method G output from the method selection circuit 109.

Next, it is assumed that the state is changed to a state where the non-contact communication power source 118 and the memory card power source 115 are supplied.
When the non-contact power supply voltage 118 is supplied, the non-contact power source voltage sensor 107 starts monitoring the non-contact power source voltage 119 and outputs a non-contact voltage state signal 123 = 1. When the memory card communication power is supplied, the memory card power supply voltage sensor 106 starts monitoring the memory card power supply voltage 116 and outputs a memory card voltage state signal 122 = 1. Since the expansion unit 201 transitions from the state of the non-contact voltage state signal 123 = 0 and the voltage state signal 122 for the memory card to the state of the non-contact voltage state signal 123 = 1 and the voltage state signal 122 for the memory card, the expansion unit 201 Bit = 1 is set, and the extension state signal 202 = 111 is output to the method selection circuit 109. Since the extension unit state signal 202 = 111, the method selection circuit 109 selects the method F that matches this state from the method storage unit 108, and sends the method to the VCO 110 and the clock selection / reset generation circuit 111 according to the method F. The signal 125 is output. The VCO 110 and the clock selection / reset generation circuit 111 are controlled by a method signal 125 by the method F output from the method selection circuit 109. That is, the VCO 110 is oscillated, and the CPU 114, the flash controller 113, and the non-contact communication encryption circuit 112 are operated using the VCO clock 124.

  FIG. 5 shows transitions between the memory card voltage state signal 122 and the non-contact voltage state signal 123. Pattern 1 corresponds to method E, and shows <when the state is changed from the state in which the non-contact communication power supply 118 is first supplied to the state in which the non-contact communication power supply 118 and the memory card power supply 115 are supplied>. Pattern 2 corresponds to method F, and indicates <when the memory card power supply 115 is first supplied to the state where the non-contact communication power supply 118 and the memory card power supply 115 are supplied>. .

  Each pattern is finally in the same power supply state (memory card power supply 115 and non-contact communication power supply 118 are both supplied), but the power supply transition is different, so the selected method is different. The VCO 110, the CPU 114, the flash controller 113, and the non-contact communication encryption circuit 112 also perform different operations. In pattern 1, the memory card power 115 is supplied while the non-contact communication power supply 118 is being supplied. However, the VCO 110 is stopped and the previous state is maintained without switching the clock. Suppress the impact, etc., and perform non-contact communication stably. In the pattern 2, the contactless communication power supply 118 is supplied while the memory card power supply 115 is supplied. However, by maintaining the oscillation of the VCO 110 and further operating the contactless communication encryption circuit 112 with the VCO clock 124, Non-contact communication is performed more stably.

<Effect>
As described above, in the second embodiment, since the expansion unit 201 is provided, each of the optimal methods, i.e., the state in which the non-contact communication power is first supplied, is contactless by the transition of the power supply state. When transitioning to a state where communication power and memory card power are being supplied, maintaining the VCO stopped and operating the CPU and the non-contact communication encryption circuit using the non-contact communication clock, A method that suppresses the effects of noise due to power fluctuations, and when transitioning from the state in which memory card power is first supplied to the state in which contactless communication power and memory card power are being supplied, By maintaining the CPU, the flash controller, and the encryption circuit for contactless communication with a stable VCO clock, more stable contactless communication is performed. Select the formula, CPU 114, the flash controller 113, for non-contact communication encryption circuit 112, it is possible to control the clock and reset, it is possible to provide a non-contact function memory card capable of stable communication.

(Embodiment 3)
FIG. 6 is a block diagram showing the configuration of the memory card with contactless communication function according to Embodiment 3 of the present invention. In addition to the configuration of the memory card with contactless communication function shown in FIG. In addition, a ROM (first ROM) 401 that can load extended information is further provided.
The ROM 401 stores information on how to add an extension bit for each transition pattern of the power supply state, and outputs an extension information signal 402 to the extension unit 201. The expansion unit 201 stores the transition of the power supply state based on the memory card voltage state signal 122 provided from the memory card power supply voltage sensor 106 and the non-contact voltage state signal 123 provided from the non-contact power supply voltage sensor 107. In accordance with the extension information loaded by the extension information signal 402 given from the ROM 401, the extension part state signal 202 with the extension bit added is output to the method selection circuit 109.

  In the memory card with the non-contact communication function configured as described above, when the memory card power 115 or the non-contact communication power 118 is supplied, the expansion unit 201 immediately outputs a load request for expansion information to the ROM 401 (not shown). ) In response to the load request from the extension unit 201, the ROM 401 reads the stored extension information for each power supply state transition pattern, and outputs the extension information signal 402 to the extension unit 201. The extension unit 201 stores the extension information given by the extension information signal 402 in the extension unit 201. When the power supply state transitions thereafter, the expansion unit 201 outputs an expansion unit state signal 202 to the method selection circuit 109 according to the stored expansion information.

<Effect>
As described above, in the third embodiment, the ROM 401 that can load the extension information is provided in the extension unit 201, so that the selection method of the method corresponding to the transition of the power supply state is changed by changing the ROM data. Can do. Therefore, for example, if the original selection method is changed from method D to method E, the method can be changed to method G. For example, the CPU 114, the flash controller 113, and the non-contact communication encryption circuit 112 can be clocked more flexibly. Since the reset can be controlled, a memory card with a non-contact function capable of stable communication can be provided.

(Embodiment 4)
FIG. 7 is a block diagram showing a configuration of a memory card with a non-contact communication function according to Embodiment 4 of the present invention. FIG. 7 is obtained by replacing the ROM 401 with a nonvolatile memory 501 in the configuration of the memory card with a non-contact communication function shown in FIG. This nonvolatile memory is provided inside the memory card controller 101.

  The nonvolatile memory 501 stores information (hereinafter referred to as extension information) on how to add extension bits for each transition pattern of the power supply state, and sends an extension information signal 402 to the extension unit 201. Output. In the memory card with a non-contact communication function having such a configuration, when the memory card power 115 or the non-contact communication power 118 is supplied, the expansion unit 201 immediately outputs a load request for expansion information to the nonvolatile memory 501. (Not shown). In response to the load request from the extension unit 201, the nonvolatile memory 501 reads the stored extension information for each transition pattern of the power supply state and outputs the extension information signal 402 to the extension unit 201. The extension unit 201 stores the extension information given by the extension information signal 402 in the extension unit 201. When the power supply state transitions thereafter, the expansion unit 201 outputs an expansion unit state signal 202 to the method selection circuit 109 according to the stored expansion information. The nonvolatile memory 501 can be accessed from the CPU 114, and the extended information can be arbitrarily changed after the CPU 114 operates.

<Effect>
As described above, in the fourth embodiment, the extension information can be loaded into the extension unit 201 and the nonvolatile memory 501 capable of changing the extension information is provided, so that the power supply state can be changed during system operation. The selection method of the selected method can be arbitrarily changed. For this reason, the method information stored in the method storage unit more flexibly, such as by rewriting the non-volatile memory, the method D can be changed to the method E if it is the original selection method. Since the selection method can be changed, the clock and reset can be controlled for the CPU 114, the flash controller 113, and the non-contact communication encryption circuit 112, and a memory card with a non-contact function capable of stable communication can be provided. .

(Embodiment 5)
FIG. 8 is a block diagram showing a configuration of a memory card with a non-contact communication function according to Embodiment 5 of the present invention. The memory card communication circuit 104 having the configuration of the memory card with a non-contact communication function shown in FIG. Instead, it further includes a memory card communication circuit (an extension bit addition information communication circuit) 601 with a load function capable of loading extension information to the extension unit 201.

  A memory card communication circuit 601 with a load function receives memory card data 117 provided from a digital device (not shown), detects and extracts extension information included in the received data, and extends the extension unit 201. An information signal 402 is output. In the memory card with a non-contact communication function having such a configuration, the digital device (not shown) transmits extension information (information on how to add an extension bit for each power supply state transition pattern) to the memory card. Is transmitted to the memory card communication circuit 601 with a load function as the data for use 117. When detecting the extension information in the memory card data 117 sent from the digital device, the memory card communication circuit 601 with a load function extracts the extension information and outputs the extension information signal 402 to the extension unit 201. The extension unit 201 stores the extension information given by the extension information signal 402 in the extension unit 201. When the power supply state transitions thereafter, the expansion unit 201 outputs an expansion unit state signal 202 to the method selection circuit 109 according to the stored expansion information.

  Note that the memory card communication circuit 601 with a load function is a non-contact communication circuit with a load function capable of loading extension information into the expansion unit 201, the memory card data 117 is non-contact communication data 121, and an external digital device is connected to an external non-contact device. It may be a contact communication host device.

<Effect>
As described above, in the fifth embodiment, the expansion unit 201 includes the memory card communication circuit 601 with a load function that can load the extension information, so that the external digital device can respond to the power supply state transition. The method of selecting a method can be arbitrarily changed. For this reason, the method selection method can be changed by control from an external device equipped with a memory card, and the clock and reset are controlled more flexibly with respect to the CPU 114, the flash controller 113, and the non-contact communication encryption circuit 112. Therefore, a memory card with a non-contact function capable of stable communication can be provided.

(Embodiment 6)
FIG. 9 is a block diagram showing a configuration of a memory card with a non-contact communication function according to Embodiment 6 of the present invention. In addition to the configuration of the memory card with a non-contact communication function shown in FIG. Prepare.

The timer 701 resets the counter based on the memory card voltage state signal 122 provided from the memory card power supply voltage sensor 106 and the non-contact voltage state signal 123 provided from the non-contact power supply voltage sensor 107. The timer 701 outputs a time information signal 702 to the nonvolatile memory 501 when the counter reaches a set value.
The nonvolatile memory 501 stores information (extended information) on how to add an extension bit for each transition pattern of the power supply state, and the extension unit 201 is instructed according to the time information signal 702 given by the timer 701. The extended information signal 402 is output.

  In the memory card with the non-contact communication function having such a configuration, when the memory card power 115 or the non-contact communication power 118 is supplied, the timer 701 starts counting immediately. If the memory card voltage state signal 122 or the non-contact voltage state signal 123 changes before reaching the counter set value of the timer 701, the timer 701 resets the counter and starts counting again. If the memory card voltage state signal 122 or the non-contact voltage state signal 123 does not change before reaching the counter set value of the timer 701, the timer 701 sends a time information signal 702 to the nonvolatile memory 501. Output. The nonvolatile memory 501 reads the stored extended information for each transition pattern of the power supply state by the time information signal 702 given from the timer 701, and outputs the extended information signal 402 to the expansion unit 201. The extension unit 201 stores the extension information given by the extension information signal 402 in the extension unit 201. When the power supply state transitions thereafter, the expansion unit 201 outputs an expansion unit state signal 202 to the method selection circuit 109 according to the stored expansion information.

  For example, in the power supply state transition of the pattern 1 of FIG. 5, the timer 701 counts only when the non-contact communication power supply 118 is supplied, and resets the counter when the non-contact communication power supply 118 is not supplied. Then. The idea of pattern 1 is that the power supply and the clock are not switched while the non-contact communication power supply 118 is supplied, and the memory card communication is put on hold with priority given to the stability of the non-contact communication. In such pattern 1, when the communication from the non-contact communication host device does not end indefinitely and the memory card power supply 115 is supplied (access to the memory card by the digital device), the memory card becomes a flash controller. 113 remains stopped, and memory card communication cannot be started. At this time, the timer 701 measures the time when the non-contact communication power supply 118 is supplied, and outputs a time information signal 702 to the nonvolatile memory 501 when the counter setting value is reached. The non-volatile memory 501 changes the extended information signal 402 representing the current method E to the method F by the time information signal 702 and outputs it to the extension unit 201. This makes it possible to determine whether or not contactless communication has failed depending on the timer setting value, i.e. whether or not the supply time of the contactless communication power supply has been reached. Communication can be stopped and memory card communication can be started using the VCO clock as the clock.

<Effect>
As described above, in the sixth embodiment, the timer 701 for measuring the time of the power supply state is provided, so that the optimum method selection method can be arbitrarily changed according to the length of time during which the power is supplied. It is possible to control the clock and reset for the CPU 114, the flash controller 113, and the non-contact communication encryption circuit 112 more flexibly, so that a memory card with a non-contact function capable of stable communication can be provided. .

(Embodiment 7)
FIG. 10 is a block diagram showing a configuration of a memory card with a non-contact communication function according to Embodiment 7 of the present invention. In addition to the configuration of the memory card with a non-contact communication function shown in FIG. Further prepare.

  The learning device 801 monitors the time information signal 702 given from the timer 701 and learns how often the time information signal 702 is generated. The learning device 801 outputs a learning information signal 802 to the nonvolatile memory 501 based on the learning result. The nonvolatile memory 501 stores information (extended information) on how to add an extension bit for each transition pattern of the power supply state, and is given from a learning information signal 802 and a timer 701 given by the learning device 801. The extended information signal 402 is output to the extension unit 201 in accordance with the time information signal 702 to be transmitted.

  In the memory card with the non-contact communication function configured as described above, the learning device 801 monitors the time information signal 702 output from the timer 701 and learns the frequency with which the time information signal 702 is generated. When the learning device 801 learns that the time information signal 702 is generated frequently, the learning device 801 outputs the learning information signal 802 to the nonvolatile memory 501. The nonvolatile memory 501 normally reads the stored extended information for each power supply state transition pattern by the time information signal 702 given from the timer 701 and outputs the extended information signal 402 to the expansion unit 201. When the learning information signal 802 is output from the learning device 801, the learning information signal 802 is prioritized and the extension information signal 402 is output to the extension unit 201 according to the information. The extension unit 201 stores the extension information given by the extension information signal 402 in the extension unit 201. When the power supply state transitions thereafter, the expansion unit 201 outputs an expansion unit state signal 202 to the method selection circuit 109 according to the stored expansion information.

  For example, in the transition of the power supply state of pattern 1 in FIG. 5, if the communication from the non-contact communication host device does not end indefinitely and the memory card power 115 is supplied, the memory card stops the clock of the flash controller 113. The memory card communication cannot be started, but the timer 701 outputs the time information signal 702 to the non-volatile memory 501, so that the non-volatile memory 501 represents the current method E. The extension information signal 402 is changed to the method F and output to the extension unit 201. Thereby, the memory card can start memory card communication. The learning device 801 learns the frequency with which the time information signal 702 is generated. In other words, this frequency indicates the frequency at which communication from the non-contact communication host device does not end indefinitely and a state in which the memory card power supply 115 is supplied occurs. Such a situation occurs, for example, when the user does not sufficiently bring the card close to the host device for non-contact communication or the touch is often insufficient.

If the learning device 801 learns that the frequency is high, it is determined that, for example, it is more optimal to use the method F than the current method E under the conditions that the user frequently uses. Outputs the learning information signal 802 so that extended information for selecting the method F from the method D is output to the extension unit 201 instead of the extended information for selecting the method E from the method D.
A learning device that executes a known learning algorithm can be used.

<Effect>
As described above, in the seventh embodiment, the learning device 801 that learns the frequency of occurrence of the time information signal 702 output from the timer 701 is provided, so that the conditions frequently used by the user are learned and optimized. Since the clock and reset can be controlled more flexibly to the CPU 114, the flash controller 113, and the non-contact communication encryption circuit 112, the non-contact capable of stable communication. A memory card with functions can be provided.

(Embodiment 8)
FIG. 11 is a block diagram showing a configuration of a memory card with a non-contact communication function according to Embodiment 8 of the present invention. In addition to the configuration of the memory card with a non-contact communication function shown in FIG. 901 is further provided.

  The fraud pattern collator 901 stores a power supply state pattern that is recognized as fraud in advance, and is supplied from the memory card voltage state signal 122 supplied from the memory card power supply voltage sensor 106 and from the non-contact power supply voltage sensor 107. By using the non-contact voltage state signal 123 and the time information signal 702 given from the timer 701, an unauthorized power supply state pattern is detected and an unauthorized information signal 902 is output to the CPU 114. In the memory card with the non-contact communication function configured as described above, the illegal pattern collator 901 includes the memory card voltage state signal 122 supplied from the memory card power supply voltage sensor 106 and the non-contact power supply voltage sensor 107. The current power supply state and the transition of the power supply state are recognized from the contact voltage state signal 123, and the duration of the power supply state is recognized from the time information signal 702 given from the timer 701. The unauthorized pattern collator 901 stores a power supply state pattern that is recognized as unauthorized in advance, and determines that an unauthorized action is being performed if the unauthorized pattern matches the recognized power supply state transition pattern. The illegal information signal 902 is output to the CPU 114.

The CPU 114 receives the fraud information signal 902 and executes countermeasures against fraudulent acts.
For example, FIG. 12 shows a case where the non-contact communication power source 118 is supplied many times at short intervals with respect to the time during which non-contact communication is performed while the memory card power source 115 is supplied. . If the supply time of one non-contact communication power supply 118 is 1 μs or less and this is repeated 10 times or more, an illegal pattern is assumed. First, the illegal pattern collator 901 is supplied with the memory card power 115 and the non-contact communication power 118 based on the memory card voltage state signal 122 and the non-contact voltage state signal 123. Recognize that it is in a state. The timer 701 outputs the current power supply state duration to the time information signal 702, and the illegal pattern collator 901 records the current duration. Next, when the non-contact communication power supply 118 is not supplied, the unauthorized pattern collator 901 recognizes that the current power supply state is a state in which only the memory card power supply 115 is supplied. In addition, the timer 701 clears the duration of the previous power supply state, newly starts counting the duration, and outputs it to the time information signal 702. When the duration of the previous power supply state is cleared, the illegal pattern collator 901 determines whether the duration immediately before being cleared is 1 μs or less. If it is 1 μs or less, this is recorded as the first flag and monitoring is continued. When this pattern occurs ten times or more and the tenth flag is recorded, it is determined that the pattern matches the illegal pattern, and an illegal information signal 902 is output to the CPU 114. The CPU 114 performs fraud countermeasure processing (for example, forcibly resetting or erasing all data) using the fraud information signal 902 as an interrupt factor.

  This makes it possible, for example, to use a contactless communication host device to access many times for the purpose of analysis, or to frequently repeat unnatural patterns that cannot be considered in normal use, and to see the reaction at that time. It is possible to prevent fraudulent acts such as trying to analyze the inside of the system and its preliminary actions.

<Effect>
As described above, according to the eighth embodiment, since the unauthorized pattern collator 901 is provided, an unauthorized power supply state transition can be detected, so that the use different from the normally assumed use state is repeatedly executed. In this case, it is possible to provide a memory card with a non-contact function that enables safe and stable communication against fraudulent acts and preparatory actions such as trying to analyze the inside of the card by observing the reaction of the card.

(Embodiment 9)
FIG. 13 is a block diagram showing the configuration of the memory card with contactless communication function according to Embodiment 9 of the present invention. In addition to the configuration of the memory card with contactless communication function shown in FIG. A ROM (second ROM) 1101 for loading the method is further provided.

  The ROM 1101 stores the VCO 110, the CPU 114, the flash controller 113, the clock of the non-contact communication encryption circuit 112, and the reset control method (method) according to the power supply state. An information signal 1102 is output. In the memory card with the non-contact communication function having such a configuration, when the memory card power 115 or the non-contact communication power 118 is supplied, the method storage unit 108 immediately outputs a method load request to the ROM 1101 (not shown). ) The ROM 1101 reads the stored method in response to the load request from the method storage unit 108, and outputs a method information signal 1102 to the method storage unit 108. The method storage unit 108 stores the method given by the method information signal 1102 in the method storage unit 108.

<Effect>
As described above, in the ninth embodiment, the ROM 1101 that can load a method to the method storage unit 108 is provided, so that the method information itself stored in the method storage unit 108 is changed by changing the ROM data (software). It can be replaced. Therefore, it is possible to control the clock and reset for the CPU 114, the flash controller 113, and the non-contact communication encryption circuit 112 more flexibly, and a memory card with a non-contact function capable of stable communication can be provided.

(Embodiment 10)
FIG. 14 is a block diagram showing a configuration of a memory card with a non-contact communication function according to Embodiment 10 of the present invention. In addition to the configuration of the memory card with a non-contact communication function shown in FIG. Is further provided.

  The power supply request unit 1201 includes a memory card voltage state signal 122 provided from the memory card power supply voltage sensor 106, a non-contact voltage state signal 123 provided from the non-contact power supply voltage sensor 107, and a time information signal provided from the timer 701. The current power supply state is monitored by 702, and when it is determined that the memory card power supply 115 is necessary, a power request signal 1202 is output to the memory card communication circuit 104. In the memory card with a non-contact communication function having such a configuration, when only the non-contact communication power supply 118 is supplied, the non-contact communication power supply 118 is inferior in power supply capability to the memory card power supply 115. In the selection circuit 109, in order to suppress power consumption, a method for limiting the function blocks to be operated or stopping the VCO 110 must be selected. In such a case, the power supply request unit 1201 outputs a power request signal 1202 to the memory card communication circuit 104 so as to supply the memory card power supply 115 having a high supply capability. The memory card communication circuit 104 receives the power request signal 1202 supplied from the power request unit 1201 and outputs memory card data 117 to an external digital device (not shown) to make a power request. When the digital device receives the power request, it starts supplying the memory card power 115 to the memory card with the non-contact communication function. The method selection circuit 109 selects a method in which both the memory card power supply 115 and the non-contact communication power supply 118 are supplied, that is, a method in which all the functional blocks operate and the VCO 110 oscillates and operates at a high-speed clock. To do.

<Effect>
As described above, in the tenth embodiment, when only the non-contact communication power source 118 is supplied, the power request unit 1201 that requests the supply of the memory card power source 115 is provided. Since the power supply can be stabilized and the VCO 110 can be oscillated and operated with a high-speed clock, a memory card with a contactless function capable of more stable and high-speed communication can be provided.

In Embodiments 1 to 10, the circuit block that can be implemented in software may be realized by software.
In the first to tenth embodiments, an example in which the mobile phone is mounted in the slot has been described. However, the mobile phone may be mounted in another device, or the card reader / writer may be held or touched as a single card. Both non-contact communication and contact communication inserted into the slot of the card reader / writer may be supported.
Further, in Embodiments 1 to 10 described above, automatic ticket gates and service point card reader / writers of shops have been described as examples, but they may be applied to so-called electronic money cards, credit cards, employee ID cards, entrance / exit management, and the like. .

  As described above, the semiconductor device according to the present invention can improve the communication stability of a card that uses both contactless communication and contact communication, and improves the reliability of a settlement system and an authentication system using this type of card. Is available.

1 is a block diagram showing an overall configuration of a memory card with a non-contact function as a semiconductor device according to a first embodiment of the present invention. 1 is a block diagram showing an overall configuration of a memory card with a non-contact function as a semiconductor device according to a first embodiment of the present invention, including a data flow and an entire power supply system. It is an example of the use condition of the memory card with a non-contact function as a semiconductor device by Embodiment 1 of this invention. It is a block diagram which shows the structure of the memory card with a non-contact function as a semiconductor device by Embodiment 2 of this invention. It is the figure which showed the transition of the power supply state in Embodiment 2 of this invention. It is a block diagram which shows the structure of the memory card with a non-contact function as a semiconductor device by Embodiment 3 of this invention. It is a block diagram which shows the structure of the memory card with a non-contact function as a semiconductor device by Embodiment 4 of this invention. It is a block diagram which shows the structure of the memory card with a non-contact function as a semiconductor device by Embodiment 5 of this invention. It is a block diagram which shows the structure of the memory card with a non-contact function as a semiconductor device by Embodiment 6 of this invention. It is a block diagram which shows the structure of the memory card with a non-contact function as a semiconductor device by Embodiment 7 of this invention. It is a block diagram which shows the structure of the memory card with a non-contact function as a semiconductor device by Embodiment 8 of this invention. It is the figure which showed the transition of the power supply state in Embodiment 8 of this invention. It is a block diagram which shows the structure of the memory card with a non-contact function as a semiconductor device by Embodiment 9 of this invention. It is a block diagram which shows the structure of the memory card with a non-contact function as a semiconductor device by Embodiment 10 of this invention.

Explanation of symbols

101 Memory Card Controller 102 Coil Antenna 103 Flash Memory 104 Memory Card Communication Circuit 105 Non-Contact Communication Circuit 106 Memory Card Power Supply Voltage Sensor 107 Non-Contact Power Supply Voltage Sensor 108 Method Storage Unit 109 Method Selection Circuit 110 VCO
111 Clock selection / reset generation circuit 112 Non-contact communication encryption circuit 113 Flash controller 114 CPU
115 Memory Card Power Supply 116 Memory Card Power Supply Voltage 117 Memory Card Data 118 Contactless Communication Power Supply 119 Contactless Power Supply Voltage 120 Contactless Communication Clock 121 Contactless Communication Data 122 Memory Card Voltage State Signal 123 Contactless Voltage State Signal 124 VCO clock 125 System signal 126 CPU clock 127 Flash controller clock 128 Non-contact communication encryption circuit clock 129 CPU reset 130 Flash controller reset 131 Non-contact communication encryption circuit reset 201 Extension unit 202 Extension state signal 401 ROM
402 Extended information signal 501 Non-volatile memory 601 Memory card communication circuit 701 with load function Timer 702 Time information signal 801 Learning device 802 Learning information signal 901 Unauthorized pattern collator 902 Unauthorized information signal 1101 ROM
1102 Method information signal 1201 Power supply request unit 1202 Power request signal

Claims (12)

A card-type semiconductor device,
A contact communication unit that receives power supply from outside by contact communication and transmits and receives data; and
A first power supply state detection unit that detects a state of a power supply supplied by contact communication, output from the first communication unit;
A non-contact communication unit that receives power and a clock signal from the outside by non-contact communication and transmits and receives data;
A second power supply state detection unit that detects the state of the power supply supplied by non-contact communication that is output from the second communication unit;
A method storage unit storing a plurality of clock signal and reset signal control methods (hereinafter referred to as methods) according to the power supply state;
A method selection unit that selects one of a plurality of methods stored in the method storage unit according to detection results of the first power supply state detection unit and the second power supply state detection unit;
An oscillating unit for receiving a power supply from the contact communication unit and oscillating a clock signal;
A clock selection / reset generation unit that generates a reset signal by selecting either a clock signal supplied from the second communication unit or a clock signal supplied from the oscillation unit according to the method selected by the method selection unit With
A semiconductor device. A contact communication unit that receives power supply from outside by contact communication and transmits and receives data; and
A non-contact communication unit that receives power and a clock signal from the outside by non-contact communication and transmits and receives data;
An oscillating unit for receiving a power supply from the contact communication unit and oscillating a clock signal;
When the contact communication and the non-contact communication are performed simultaneously, the clock signal selection unit for selecting either the clock signal supplied from the non-contact communication unit and the clock signal supplied from the oscillation unit,
A semiconductor device. In a card type semiconductor device with a non-contact communication function,
A memory card communication circuit that receives power from the outside by contact communication and transmits and receives data;
A power supply voltage sensor for the memory card that detects the state of the power supply for the memory card output from the communication circuit for the memory card;
A non-contact communication circuit that receives power and clock signals from outside and transmits and receives data; and
A non-contact power supply voltage sensor for detecting a state of a non-contact communication power source output from the non-contact communication circuit;
A method storage unit that stores a plurality of method information about the supply of clock signals and reset signals according to the state of power supply,
From the detection result of the power supply voltage sensor for the memory card and the detection result of the non-contact power supply voltage sensor, a method selection circuit that selects one of the method information stored in the method storage unit,
A VCO for receiving a power supply from the memory card communication circuit and generating a clock signal;
A CPU for performing various arithmetic processes;
A flash controller controlled by the CPU;
A flash memory that exchanges data with the flash controller;
An encryption circuit for contactless communication that performs encryption processing during contactless communication; and
A clock signal supplied from the non-contact communication circuit and a clock supplied from the VCO to each of the CPU, the flash controller, and the non-contact communication encryption circuit according to the method information selected by the method selection circuit. A clock selection / reset generation circuit that selects any one of the signals and generates a reset signal to be input to each of the circuits;
A semiconductor device. The semiconductor device according to claim 3.
A bit expansion unit for adding an expansion bit according to the transition between the power state for the memory card and the non-contact communication power state;
The method selection circuit performs selection in consideration of the extension bit when selecting an optimum method based on the transition of the power state.
A semiconductor device. The semiconductor device according to claim 4,
A first ROM storing extension bit grant information indicating a method of giving the extension bit;
The extension unit requests loading of information stored in the first ROM when at least one of the power supply for the memory card and the non-contact communication power supply is supplied.
A semiconductor device. The semiconductor device according to claim 4,
A non-volatile memory storing extension bit grant information indicating a method of giving the extension bit;
The extension unit requests loading of information stored in the nonvolatile memory when at least one of the power source for the memory card and the non-contact communication power source is supplied.
A semiconductor device. The semiconductor device according to claim 4,
An extension bit grant information communication circuit for receiving the extension bit grant information indicating the extension bit grant method by communication from the outside;
The extension bit grant information communication circuit loads the extension bit grant information to the extension unit when detecting communication from the outside.
A semiconductor device. The semiconductor device according to claim 6.
A timer for measuring the supply time of either the memory card power supply or the non-contact communication power supply,
The extension unit determines information to be loaded into the extension unit from extension bit grant information stored in the nonvolatile memory according to supply time information from the timer.
A semiconductor device. The semiconductor device according to claim 8,
A learning device that learns a frequently occurring power supply state from the power supply state and the supply time information from the timer,
The learning device determines information to be loaded into the extension unit from the extension bit grant information stored in the nonvolatile memory according to the learned content.
A semiconductor device. The semiconductor device according to claim 8,
It further includes a fraud pattern collator that monitors power pattern transition patterns and collates with fraud patterns.
Informing the CPU whether or not the power state transition corresponds to an illegal pattern;
A semiconductor device. The semiconductor device according to claim 3.
A second ROM that stores method information other than the method information stored in the method storage unit;
The method storage unit loads the method information stored in the second ROM into the method storage unit.
A semiconductor device. The semiconductor device according to claim 3.
The power supply state is monitored, and when it is determined that a power supply for the memory card is necessary, the power supply requesting unit that requests power supply to the memory card communication circuit is further provided.
A semiconductor device.

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