WO2012026002A1 - データ処理装置およびデータ処理システム - Google Patents
データ処理装置およびデータ処理システム Download PDFInfo
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- WO2012026002A1 WO2012026002A1 PCT/JP2010/064363 JP2010064363W WO2012026002A1 WO 2012026002 A1 WO2012026002 A1 WO 2012026002A1 JP 2010064363 W JP2010064363 W JP 2010064363W WO 2012026002 A1 WO2012026002 A1 WO 2012026002A1
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- power
- reset
- porb
- circuit
- reset circuit
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/3296—Power saving characterised by the action undertaken by lowering the supply or operating voltage
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/24—Resetting means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied
- H03K17/223—Modifications for ensuring a predetermined initial state when the supply voltage has been applied in field-effect transistor switches
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied
- H03K17/24—Storing the actual state when the supply voltage fails
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0081—Power supply means, e.g. to the switch driver
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
Definitions
- the present invention relates to a data processing device, and more particularly, to a data processing device having a central processing unit and a data processing system using the data processing device.
- the device has been passively controlled, but recently, one of the devices that is required to perform active control by a data processing device including a central processing unit (CPU) is a power source. There is a meter.
- CPU central processing unit
- the conventional power meter has a function to measure and record the amount of electric power generated by the electric power company and supplied to each home via the distribution network, and the electric power usage recorded via a predetermined communication line is stored in the electric power company.
- the function to transmit was required for the data processing device.
- power meters used in next-generation distribution networks distribute not only the process of measuring the amount of power distributed by power companies, but also the power from power generation facilities such as solar cells and power storage facilities installed in each home.
- the data processing device is required to perform a return control for returning to the network and a process for canceling the distribution power amount and the return power amount.
- the data processing apparatus is put into a low power consumption state in the standby state.
- a low power consumption state not only the supply of power to the functional units including the central processing unit (CPU) in the data processing device and the stop of the oscillator that generates the operation clock but also the power supply circuit in the data processing device itself. Therefore, it is necessary to suppress the power consumption.
- a power-on reset operation is detected in the data processing device by detecting a voltage change from the voltage level immediately after the start of supply to the operating voltage level with respect to the power supply voltage supplied from the outside.
- the POR circuit compares the external power supply voltage with a reference voltage, detects that the external power supply voltage has risen to a predetermined voltage level, and outputs a reset signal to the data processing device. ) Have other circuits initialize.
- an LVD (Low Voltage Detect) circuit that detects when the external power supply voltage drops to a predetermined voltage level and issues an interrupt signal or reset signal indicating a voltage drop to the central processing unit (CPU) is provided. And causing the central processing unit (CPU) to perform an operation or an initialization operation in response to a voltage drop.
- LVD Low Voltage Detect
- POR circuits and LVD circuits include a reference voltage generation circuit using a BGR (Band Gap Reference) circuit that allows a constant amount of steady current to flow. This steady current contributes to the current consumption during the low power consumption state of the data processing apparatus.
- BGR Band Gap Reference
- An object of the present invention is to provide a data processing device and a data processing system capable of reducing current consumption in a standby state.
- the present invention is a data processing device, comprising: a first power-on reset circuit; a second power-on reset circuit that consumes more power and has a higher reset voltage accuracy than the first power-on reset circuit; A storage unit for storing information for setting whether to hold the second power-on reset circuit in an active state or in an inactive state, and according to outputs of the first and second power-on reset circuits A central processing unit that is initialized and sets information in the storage unit.
- the present invention is a data processing system including a printed wiring board and a data processing device mounted on the printed wiring board.
- the data processing apparatus includes a first power-on reset circuit, a second power-on reset circuit that consumes more power than the first power-on reset circuit, and has a high reset voltage accuracy, and a second power-on reset circuit.
- a storage unit that stores information for setting whether to hold the active state or the inactive state, and is initialized according to the outputs of the first and second power-on reset circuits, And a central processing unit for setting information.
- a first reset signal generation circuit with relatively low power consumption and low detection voltage accuracy and a second reset signal generation circuit with relatively high power consumption and high detection voltage accuracy are provided.
- An example will be described in which the user can select which of the first reset generation circuit and the second reset generation circuit to use.
- FIG. 1 is a diagram illustrating an example of a data processing system having a data processing device.
- a data processing system 1 includes a printed wiring board 18, a data processing device 2 mounted on the printed wiring board 18, a sensor 4, a communication unit 6, a timer 8, and a battery 12. including.
- the data processor 2 is supplied with the voltage of the battery 12 as the power supply voltage Vcc.
- FIG. 2 is a schematic configuration diagram of a data processing apparatus having a central processing unit (CPU).
- FIG. 2 shows functional units unique to the present invention in addition to a general microcomputer configuration.
- a data processing device 2 includes a central processing unit CPU, a memory 22, a bus 21 for transferring data and addresses, a data transfer unit (direct memory access controller) DMAC, and an analog / digital conversion unit.
- An ADC, an interrupt controller INTC, a serial communication unit SCIO, a system control unit SYSC, a clock circuit 26, a power supply circuit 24, and a storage unit 28 are included.
- the central processing unit CPU sequentially executes the programs stored in the memory 22 and controls the operation of the entire data processing unit 2.
- the serial communication unit SCIO stores data input from the outside in the memory 22.
- the analog / digital conversion unit ADC converts an analog signal input from the outside into a digital value and stores it in the memory 22.
- the data transfer unit DMAC controls data transfer via the bus 21 when storing the digital data of the serial communication unit SCIO and the analog / digital conversion unit ADC in the memory 22.
- the interrupt controller INTC receives an interrupt signal issued by an external or internal functional unit and issues an interrupt to the central processing unit CPU.
- the central processing unit CPU performs processing according to the interrupt contents.
- the clock circuit 26 generates an operation clock CLK of the data processing device 2 and supplies an operation clock having a frequency corresponding to each function unit in the data processing device 2 to each function unit.
- the sensor 4 generates an analog signal to be input to the analog / digital conversion unit ADC.
- the communication unit 6 performs data communication control with the outside of the system, inputs data to the serial communication unit SCIO, or receives data from the serial communication unit SCIO.
- the timer 8 issues an interrupt signal to the data processing device 2 as the time set by the data processing device 2 elapses.
- the data processing device 2 is supplied with an operating power supply voltage Vcc by an externally connected battery.
- the degree of battery deterioration (decrease in electromotive force if it is a primary battery, decrease in current supply capacity due to decrease in power storage capacity due to repeated charge and discharge if it is a secondary battery) is a data processing device. 2 affects the operation stability.
- the power supply circuit 24 steps down or boosts the external supply power supply voltage Vcc, generates an internal operating voltage Vdd, and supplies it to a central processing unit (CPU) and the like.
- the voltage detection unit 10 generates power-on reset circuits PORa and PORb that generate a power-on reset operation in response to a voltage change in the external power supply voltage Vcc, and a voltage decrease in the external power supply voltage Vcc.
- a voltage drop detection circuit LVD for generating an interrupt signal or a reset signal.
- the power-on reset circuit PORa is a voltage detection circuit with low power consumption and low detection accuracy
- the power-on reset circuit PORb is a voltage detection circuit with high power consumption and high detection accuracy compared to the power-on reset circuit PORa. .
- the power-on reset circuit PORa detects that the external supply power supply voltage Vcc has risen to a certain voltage (PORa detection voltage Vrst (PORa)) between 2.0 V and 2.5 V, for example, and cancels the reset signal NPORA.
- the reset signal NPORA is output upon detecting that the voltage has dropped to the same voltage.
- the power-on reset circuit PORb detects that the external supply power supply voltage Vcc has increased to, for example, 2.6 V ⁇ 0.1 V (PORb detection voltage Vrst (PORb)), and cancels the reset signal NPORB or sets it to the same voltage.
- the reset signal NPORB is output upon detecting that the voltage has dropped.
- FIG. 3 is a block diagram showing the configuration of the voltage detector and the power supply circuit.
- voltage detection unit 10 includes a current source CS, a band gap reference circuit BGR, a reference voltage generation circuit VREFBUF, power-on reset circuits PORa and PORb, and a voltage drop detection circuit LVD.
- the current source CS is a constant current source for generating the bias voltage Vbias, and is always on while the data processing device 2 is powered on.
- the bandgap reference circuit BGR is a reference voltage generation circuit having a small voltage dependency and temperature dependency.
- the reference voltage generation circuit VREFBUF is a reference voltage generation circuit that performs a trimming process based on the reference voltage VrefI from the bandgap reference circuit BGR and generates a desired reference voltage VrefO.
- the data processing device 2 is a circuit that cuts off the supply of operating power to some or all of the internal circuits (stops supply) to reduce standby current when transitioning to the standby mode (low power consumption state)
- a scheme can be adopted. For example, in a predetermined low power consumption mode such as the software standby mode, the power of the built-in ROM that does not require power supply is shut off, and in a predetermined low power consumption mode such as the deep standby mode, in addition to the internal ROM Thus, the operation power supply of all or a part of the internal logic such as the CPU can be cut off. Further, when it is not necessary to hold the RAM data, the operation power supply of the RAM can be cut off.
- the power supply circuit 24 includes a plurality of step-down circuits VDC.
- the step-down circuit VDC is a circuit that generates a chip internal power supply voltage using the reference voltage from the reference voltage generation circuit VREFBUF.
- the step-down circuit VDC stops operating in the low power consumption state (deep standby mode).
- the power-on reset circuits PORa and PORb are used during the normal operation period, and the power-on reset circuit PORb can be selected to be stopped during the low power consumption period. This selection is performed by setting a register in the storage unit 28.
- the current source CS, the band gap reference circuit BGR, and the reference voltage generation circuit VREFBUF shown in FIG. 3 need to be operated.
- the current source CS needs to operate.
- the band gap reference circuit BGR and the reference voltage generation circuit VREFBUF are further stopped, current consumption in the band gap reference circuit BGR and the reference voltage generation circuit VREFBUF can be further reduced.
- FIG. 4 is a circuit diagram showing an example of the power-on reset circuit PORa.
- FIG. 5 is a circuit diagram showing an example of the power-on reset circuit PORb and the voltage drop detection circuit LVD.
- power-on reset circuit PORa includes a P channel MOS transistor 42 connected between a node to which power supply voltage Vcc is applied and node N1 and having a gate connected to a ground node, node N1 and ground node And a depletion type N channel MOS transistor 44 and a capacitor 46 connected between node N1 and the ground node.
- the power-on reset circuit PORa further includes inverters 48 and 50 connected in series and having an input connected to the node N1 and outputting a reset signal NPORA.
- the reset signal NPORA indicates a reset at a low level and indicates a reset release at a high level.
- a current source CS, a band gap reference circuit BGR, and a reference voltage generation circuit VREFBUF are shared by the power-on reset circuit PORb and the voltage drop detection circuit LVD.
- the voltage Vbias generated by the current source CS is supplied to the band gap reference circuit BGR, the reference voltage generation circuit VREFBUF, and the voltage comparators 58 and 62.
- the voltage comparator 58 receives the output of the voltage dividing circuit 54 at the plus input node, receives the output of the bandgap reference circuit BGR at the minus input node, and compares them. As shown in FIG. 3, the voltage comparator 58 may receive the output of the reference voltage generation circuit VREFBUF instead of the output of the band gap reference circuit BGR.
- the voltage comparator 58 outputs a reset signal NPRB.
- the reset signal NPORB indicates a reset at a low level and a reset release at a high level.
- the selector 56 selects one of a plurality of divided voltage outputs from the voltage dividing circuit 54.
- the selector 60 selects one of the plurality of outputs of the reference voltage generation circuit VREFBUF.
- the output of the selector 56 and the output of the selector 60 are input to the voltage comparator 62.
- the voltage comparator 62 receives the output of the selector 56 at the plus input node, receives the output of the selector 60 at the minus input node, and compares them.
- the voltage comparator 62 outputs a reset signal NLVD.
- the reset signal NLVD indicates reset at a low level and indicates reset release at a high level.
- FIG. 6 is a diagram for explaining the output characteristics of the power-on reset circuit PORa. 4 and 6, since the threshold voltage of depletion type N-channel MOS transistor 44 is a negative value, it can be made conductive even when the power supply voltage is 0V. Therefore, when the power supply voltage Vcc is 0V, the node N1 is kept at 0V. For this reason, initialization of the node N1 can be easily realized without using a passive element such as a resistor.
- the node N1 is kept at 0V while the gate-source voltage Vgs of the P-channel MOS transistor 42 is equal to or lower than the threshold voltage of the P-channel MOS transistor 42.
- This output becomes high level indicating reset release when the power supply voltage Vcc is between 2.0V and 2.5V.
- a steady current flows from the node to which the power supply voltage Vcc is applied toward the ground node, but this value is small, for example, about 0.1 ⁇ A. This steady current is determined mainly depending on the driving force of the transistor 44.
- the steady current can be kept small.
- the use of the transistor 44 is advantageous in terms of cost because the proportion of the area occupied on the chip is smaller than the use of the resistance element.
- the power-on reset circuit PORa varies when the reset release voltage VHa is in the range of 2.0V to 2.5V. This is because the balance between the threshold voltage of the inverter 48 and the driving force of the transistors 42 and 44 varies due to variations in process parameters.
- FIG. 7 is a diagram for explaining the output characteristics of the power-on reset circuit PORb.
- the output of power-on reset circuit PORb is fixed at a low level.
- Steady currents of 1 ⁇ A, 1 ⁇ A, and 0.2 ⁇ A flow through the voltage dividing circuit 54, the band gap reference circuit BGR, and the current source CS in FIG. Therefore, the power-on reset circuit PORb has a higher reset release voltage accuracy than the power-on reset circuit PORa, but also has a large steady current.
- the power-on reset circuit PORa can determine the reset output from a state in which the power supply voltage is lower than that of the power-on reset circuit PORb, and requires less steady current. Therefore, the advantages of the power-on reset circuit PORa (reset can be applied even when the power supply voltage is low and the steady current is small) and the advantages of the power-on reset circuit PORb (high accuracy of the reset release voltage) are adopted. It is desirable to adopt such a configuration.
- FIG. 8 is a block diagram showing main blocks of the data processing apparatus. The operation of shifting the data processing apparatus to the standby mode will be described with reference to this block diagram.
- the central processing unit CPU stops the power-on reset circuit PORb along with the transition to the standby mode (low power consumption state) prior to execution of the transition command to the standby mode (low power consumption state). Then, the register in the storage unit 28 is set so that only the power-on reset circuit PORa operates.
- the system control unit SYSC refers to the corresponding register in the storage unit 28, deactivates the control signal SON, and decreases the voltage.
- the detection circuit LVD and the power-on reset circuit PORb are stopped. As a result, in the standby mode (low power consumption state), only the power-on reset circuit PORa continuously operates in the voltage detection unit 10.
- system control unit SYSC refers to the setting of the corresponding register in the storage unit 28 and supplies power to the central processing unit CPU, data transfer unit DMAC, memory, analog / digital conversion unit ADC, and serial communication unit SCIO.
- the power supply circuit 24 and the clock circuit 26 are instructed to stop supply and stop clock supply, respectively.
- the central processing unit CPU sets the registers before the transition to the standby state, if the user changes the program, the power consumption state in the standby state can be changed as appropriate.
- FIG. 8 illustrates an example in which the system control unit SYSC is configured to be able to operate at a lower voltage than the central processing unit CPU, and executes control of return from the standby mode (low power consumption state).
- a control unit operable at such a low voltage may be provided.
- FIG. 9 is an operation waveform diagram for explaining the low power consumption period and the operation period.
- the external supply power supply voltage Vcc from the battery is higher than the detection voltage Vrst (PORa) of the power-on reset circuit PORa.
- the power-on reset circuit PORa continues to monitor the voltage level of the external supply voltage.
- the power-on reset circuit PORb When the data processing device 2 returns from the standby mode (low power consumption state) in response to a signal from the sensor 4 or the like of FIG. 1 connected to the outside of the data processing device 2 at time t1, the power-on reset circuit PORb Also resume operation. That is, even if an instruction to stop the power-on reset circuit PORb is written in the corresponding register of the storage unit 28 before the transition to the standby mode (low power consumption state), the register is cleared in response to the output of the reset signal NPORA. Accordingly, in response to this, the system control unit SYSC activates the signal SON, so that the power-on reset circuit PORb starts its operation.
- the data processing device 2 If the external power supply voltage Vcc is higher than the detection voltage Vrst (PORb) at this time, the data processing device 2 returns from the standby mode (low power consumption state) and performs processing corresponding to the signal input from the outside. Can be performed (operation period T1).
- the power-on reset circuit PORa outputs the reset signal NPORA.
- the data processing device 2 performs hardware (not by software reset of the CPU but by the system controller SYSC)
- the registers and other latch circuits in the circuit are initialized and wait for the reset signal to be released.
- the power-on reset circuit PORb responds to the output of the reset signal NPORA. Since it is cleared, the operation starts.
- the power-on reset circuit PORb is activated according to the reset output of the power-on reset circuit PORa. Processing is possible.
- the power-on reset circuit PORa When the external power supply voltage Vcc supplied by the battery returns to a state higher than the detection voltage Vrst (PORa) immediately after the reset signal is output as at time t3, the power-on reset circuit PORa outputs a reset release signal. Is possible. When the external power supply voltage Vcc returns to a state higher than the detection voltage Vrst (PORb), the power-on reset circuit PORb can also output a reset release signal. Accordingly, the data processing device 2 is released from reset and can be restarted.
- an unexpected value may be set in a latch circuit or the like in the circuit of the data processing device 2.
- FIG. 10 is a flowchart for explaining processing relating to a power-on reset operation executed by the data processing apparatus.
- step S1 when the normal power is turned on in step S1, the data processing apparatus shifts to the operation period of step S2 after executing the power-on reset operation.
- the power-on reset operation at this time is executed in a state where both the power-on reset circuit PORa and the power-on reset circuit PORb are activated.
- step S2 the data processing device 2 executes the data processing operation in the normal mode in which the power-on reset is canceled.
- This process is a process of a control program to be performed as a system at the time, and is, for example, a recording process of power usage executed every 24 hours in the example of the power meter.
- the central processing unit CPU and other peripheral circuits are activated and operate as necessary.
- step S2 When the operation of step S2 is completed, the data processing device 2 shifts from the normal mode to the standby mode in the low power consumption state. Before the transition to the standby mode, in step S3, the central processing unit CPU sets registers in the storage unit 28 so that only the power-on reset circuit PORa is used and the power-on reset circuit PORb is not used. . In addition, settings for stopping the voltage drop detection circuit LVD, the power supply circuit 24, and the clock circuit 26 are also written to the corresponding registers in the storage unit 28 as necessary.
- step S4 the central processing unit CPU executes a command to shift to the standby mode in the low power consumption state.
- step S5 referring to the register settings in the storage unit 28, the system control unit SYSC stops the power-on reset circuit PORb and the voltage drop detection circuit LVD, and also stops the power supply circuit 24 and the clock circuit 26. By stopping the power-on reset circuit PORb and the voltage drop detection circuit LVD, the power consumption in the standby mode is further reduced as compared with the prior art.
- step S6 the system control unit SYSC enters an input waiting state for a return factor from the standby mode (low power consumption state). As a return factor from the standby mode (low power consumption state), a return request from the communication unit 6 in FIG.
- step S6 when there is a return factor input, the process proceeds to step S10, and when there is no return factor input, the process proceeds to step S7.
- step S7 it is determined whether or not the external power supply voltage Vcc is lower than the detection voltage Vrst (PORa) of the power-on reset circuit PORa. Specifically, system control unit SYSC makes a determination based on whether or not output NPORA of power-on reset circuit PORa is at the L level. In step S7, if the external power supply voltage Vcc is not lower than the detection voltage Vrst (PORa), the process returns to step S6 and the detection of the presence of the return factor is continued again.
- step S7 if a drop in the external power supply voltage Vcc is observed, reset is executed in step S8, the register setting in the storage unit 28 is cleared, and the process proceeds to step S9.
- step S9 as in step S7, it is determined whether or not the external supply power supply voltage Vcc is lower than the detection voltage Vrst (PORa) of the power-on reset circuit PORa.
- step S9 when the external power supply voltage Vcc is not lower than the detection voltage Vrst (PORa) (when the voltage is increased), the process proceeds to step S10. On the other hand, if the external power supply voltage Vcc is still lower than the detection voltage Vrst (PORa) in step S9, the process returns to step S8 again and the reset is continued.
- step S 10 the system control unit SYSC activates the control signal SON of FIG. 5 to turn on the switch 52 and supply the power supply voltage to the circuit 70.
- the power-on reset circuit PORb and the voltage drop detection circuit LVD start operating.
- the power supply circuit and the clock circuit are activated and supply of the power supply voltage and the clock signal is started.
- step S11 it is determined whether or not the external supply power supply voltage Vcc is lower than the detection voltage Vrst (PORb) of the power-on reset circuit PORb.
- system control unit SYSC makes a determination based on whether or not output NPORB of power-on reset circuit PORb is at the L level.
- step S11 If the external power supply voltage Vcc is lower than the detection voltage Vrst (PORb) of the power-on reset circuit PORb in step S11, the reset is executed in step S12, the register setting in the storage unit 28 is cleared, and the process goes to step S13. Processing proceeds. In step S13, as in step S11, it is determined whether or not the external supply power supply voltage Vcc is lower than the detection voltage Vrst (PORb) of the power-on reset circuit PORb.
- step S13 when the external power supply voltage Vcc is lower than the detection voltage Vrst (PORb) of the power-on reset circuit PORb, step S12 is executed again to enter a reset release waiting state. If the externally supplied power supply voltage Vcc continues to be lower than the detection voltage Vrst (PORb) of the power-on reset circuit PORb, the reset is not released as shown in the period T3 in FIG.
- step S13 when the external power supply voltage Vcc becomes higher than the detection voltage Vrst (PORb) of the power-on reset circuit PORb, the reset is released and the process returns to step S10.
- step S10 the power-on reset circuit PORb and the voltage drop detection circuit LVD start operating, the power supply circuit and the clock circuit are activated, and supply of the power supply voltage and clock signal is started. If not lower than the detection voltage Vrst (PORb) of the power-on reset circuit PORb, the process proceeds to step S2, and the process of the operation period of the data processing device is executed.
- step S9 may be performed as part of the power-on (step S1) processing.
- the process waits until the external supply voltage Vcc rises (continues to execute step S9).
- the data processing device 2 includes a first power-on reset circuit PORa shown in FIG. 4 and a power consumption higher than that of the first power-on reset circuit and a high reset voltage accuracy.
- a second power-on reset circuit PORb shown in FIG. 5 a storage unit 28 for storing information for setting whether to hold the second power-on reset circuit PORb in an active state or in an inactive state,
- the CPU includes a central processing unit CPU that is initialized according to the outputs of the first and second power-on reset circuits PORa and PORb and sets information in the storage unit.
- the data processing device 2 has a normal mode and a standby mode.
- the central processing unit CPU uses the first power-on reset circuit PORb while the second power-on reset circuit PORb is deactivated, and the power supply voltage has decreased to a voltage satisfying the reset condition.
- Information is set in the storage unit 28 to perform detection.
- the central processing unit CPU sets the information in the storage unit 28 to deactivate the second power-on reset circuit PORb before shifting from the normal mode to the standby mode, and then shifts to the standby mode. To do.
- the data processing device 2 further includes a system control unit SYSC that receives the outputs of the first and second power-on reset circuits PORa and PORb.
- the system control unit SYSC indicates the reset release after the output of the first power-on reset circuit PORa indicates reset (YES in step S9) and the second power-on during the standby mode. If the reset circuit PORb has been deactivated, the second power-on reset circuit PORb is activated (step S10), and the output of the second power-on reset circuit PORb indicates reset release (step S13). (NO in step S11 and NO in step S11), the reset of the central processing unit CPU is released.
- the data processing device 2 has a normal mode and a standby mode.
- the central processing unit CPU can select whether to use the second power-on reset circuit PORb during the standby mode by setting information in the storage unit 28 before shifting from the normal mode to the standby mode. . That is, in the embodiment, the example in which the second power-on reset circuit PORb is not used in the standby mode has been described. However, if the program executed by the central processing unit CPU is changed, the second power-on reset circuit PORb is also set in the standby mode. You can also change the behavior to use.
- the first power-on reset circuit PORa includes an inverter 48 that is connected to the input of an internal node N1 that is charged with the potential of the power supply node rising and the potential of which rises.
- the second power-on reset circuit PORb includes a comparison circuit 58 that compares the output of the band gap reference circuit BGR with the output of the voltage dividing circuit 54 that divides the voltage of the power supply node.
- 1 data processing system 2 data processing device, 4 sensor, 6 communication unit, 8 timer, 10 voltage detection unit, 12 battery, 18 printed wiring board, 21 bus, 22 memory, 24 power supply circuit, 26 clock circuit, 28 storage unit , 42, 44 transistor, 46 capacitor, 48, 50 inverter, 52 switch, 54 voltage divider circuit, 56, 60 selector, 58, 62 voltage comparator, 70 circuit, ADC analog / digital converter, BGR bandgap reference circuit, CPU central processing unit, CS current source, DMAC data transfer unit, INTC interrupt controller, LVD voltage drop detection circuit, PORa, PORb power-on reset circuit, SCIO serial communication unit, SYSC system control unit, DC step-down circuit, VREFBUF reference voltage generating circuit.
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Abstract
Description
図1を参照して、データ処理システム1は、プリント配線基板18と、プリント配線基板18上に搭載されたデータ処理装置2と、センサ4と、通信部6と、タイマ8と、バッテリ12とを含む。データ処理装置2にはバッテリ12の電圧が電源電圧Vccとして供給される。
図3を参照して、電圧検出部10は、カレントソースCSと、バンドギャップリファレンス回路BGRと、基準電圧発生回路VREFBUFと、パワーオンリセット回路PORa,PORbと、電圧低下検出回路LVDとを含む。
図5は、パワーオンリセット回路PORbおよび電圧低下検出回路LVDの一例を示した回路図である。
図4、図6を参照して、ディプレッション型のNチャネルMOSトランジスタ44の閾値電圧はマイナスの値のため、電源電圧が0Vであっても導通状態にすることができる。このため、電源電圧Vccが0Vの時は、ノードN1は0Vに保たれている。このため、抵抗などのパッシブ素子を用いることなくノードN1の初期化を容易に実現できる。
図7を参照して、外部から供給される電源電圧Vccが0Vから電圧VLbに上昇すると、パワーオンリセット回路PORbの出力はロウレベルに確定する。そしてこの出力がリセット解除を示すハイレベルに遷移するのは、電源電圧Vccが2.6V±0.1Vの間である。すなわち、Vcc=2.5V~2.7Vの間でリセットが解除される。図5の分圧回路54、バンドギャップリファレンス回路BGR、カレントソースCSには、それぞれ1μA,1μA,0.2μAの定常電流が流れる。したがって、パワーオンリセット回路PORbは、パワーオンリセット回路PORaと比較すると、リセット解除の電圧精度は高いが、定常電流も多い。
図8、図9を参照して、時刻t1以前の待機モード(低消費電力状態)において、バッテリからの外部供給電源電圧Vccが、パワーオンリセット回路PORaの検出電圧Vrst(PORa)よりも高い間は、パワーオンリセット回路PORaは外部供給電圧の電圧レベルの監視を継続する。
またバッテリではなく電流供給能力の低下が生じない商用電源からの電源供給であったとしてもシステム全体としての低消費電力化は実現することができる。
Claims (7)
- 第1のパワーオンリセット回路(PORa)と、
前記第1のパワーオンリセット回路よりも消費電力が多くかつリセット電圧精度の高い第2のパワーオンリセット回路(PORb)と、
前記第2のパワーオンリセット回路(PORb)を活性状態に保持するか非活性状態にしておくかを設定するための情報を記憶する記憶部(28)と、
前記第1および第2のパワーオンリセット回路(PORa,PORb)の出力に応じて初期化されるとともに、前記記憶部(28)に前記情報を設定する中央処理装置(CPU)とを備える、データ処理装置。 - 前記データ処理装置は、通常モードと待機モードとを有し、
前記中央処理装置(CPU)は、前記待機モードにおいては前記第2のパワーオンリセット回路(PORb)を非活性化した状態で前記第1のパワーオンリセット回路(PORb)を使用して電源電圧がリセット条件を満たす電圧に低下したことの検出を行なうように前記記憶部(28)に前記情報を設定する、請求の範囲第1項に記載のデータ処理装置。 - 前記中央処理装置(CPU)は、前記通常モードから前記待機モードに移行する前に前記記憶部(28)の前記情報を前記第2のパワーオンリセット回路(PORb)を非活性状態にするように設定してから前記待機モードに移行する、請求の範囲第2項に記載のデータ処理装置。
- 前記第1および第2のパワーオンリセット回路(PORa,PORb)の出力を受ける制御部(SYSC)をさらに備え、
前記制御部(SYSC)は、前記待機モード中に前記第1のパワーオンリセット回路(PORa)の出力がリセットを示した後にリセット解除を示しかつ前記第2のパワーオンリセット回路(PORb)が非活性化されていた場合には、前記第2のパワーオンリセット回路(PORb)を活性化し、前記第2のパワーオンリセット回路(PORb)の出力がリセット解除を示したときに前記中央処理装置(CPU)のリセットを解除する、請求の範囲第3項に記載のデータ処理装置。 - 前記データ処理装置は、通常モードと待機モードとを有し、
前記中央処理装置(CPU)は、前記通常モードから前記待機モードに移行する前に前記記憶部(28)の前記情報を設定することにより、前記第2のパワーオンリセット回路(PORb)を前記待機モード中に使用するか否かを選択可能である、請求の範囲第1項に記載のデータ処理装置。 - 前記第1のパワーオンリセット回路(PORa)は、電源ノードの電位の上昇に伴って充電され電位が上昇する内部ノード(N1)が入力に接続されたインバータ(48)を含み、
前記第2のパワーオンリセット回路(PORb)は、バンドギャップリファレンス回路(BGR)の出力と電源ノードの電圧を分圧する分圧回路(54)の出力とを比較する比較回路(58)を含む、請求の範囲第1項に記載のデータ処理装置。 - データ処理システムであって、
プリント配線基板(18)と、
前記プリント配線基板に搭載されたデータ処理装置(2)とを備え、
前記データ処理装置(2)は、
第1のパワーオンリセット回路(PORa)と、
前記第1のパワーオンリセット回路よりも消費電力が多くかつリセット電圧精度の高い第2のパワーオンリセット回路(PORb)と、
前記第2のパワーオンリセット回路(PORb)を活性状態に保持するか非活性状態にしておくかを設定するための情報を記憶する記憶部(28)と、
前記第1および第2のパワーオンリセット回路(PORa,PORb)の出力に応じて初期化されるとともに、前記記憶部(28)に前記情報を設定する中央処理装置(CPU)とを含む、データ処理システム。
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US13/816,477 US9239612B2 (en) | 2010-08-25 | 2010-08-25 | First power-on reset circuit with higher power consumption than a second power-on reset circuit |
JP2012530468A JP5475889B2 (ja) | 2010-08-25 | 2010-08-25 | データ処理装置およびデータ処理システム |
PCT/JP2010/064363 WO2012026002A1 (ja) | 2010-08-25 | 2010-08-25 | データ処理装置およびデータ処理システム |
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009302810A (ja) * | 2008-06-12 | 2009-12-24 | Denso Corp | パワーオンリセット回路 |
JP2010147979A (ja) * | 2008-12-22 | 2010-07-01 | Elpida Memory Inc | 半導体装置およびパワーオンリセット回路の調整方法 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3036290B2 (ja) * | 1993-04-08 | 2000-04-24 | 日本電気株式会社 | パワー・オン・リセット回路 |
JP2000231791A (ja) * | 1998-12-10 | 2000-08-22 | Fujitsu Ltd | 半導体記憶装置及びデータバスのリセット方法 |
JP4462743B2 (ja) * | 2000-03-29 | 2010-05-12 | 株式会社ルネサステクノロジ | パワーオンリセット回路 |
US6629265B1 (en) * | 2000-04-18 | 2003-09-30 | Cypress Semiconductor Corp. | Reset scheme for microcontrollers |
JP2004048429A (ja) * | 2002-07-12 | 2004-02-12 | Matsushita Electric Ind Co Ltd | パワーオンリセット回路 |
JP2005039635A (ja) * | 2003-07-16 | 2005-02-10 | Matsushita Electric Ind Co Ltd | パワーオンリセット回路 |
JP4172378B2 (ja) * | 2003-11-14 | 2008-10-29 | 沖電気工業株式会社 | パワーオンリセット回路 |
TWI241767B (en) * | 2004-11-25 | 2005-10-11 | Sunplus Technology Co Ltd | Power-low reset circuit |
JP4896472B2 (ja) * | 2005-09-12 | 2012-03-14 | 株式会社リコー | パワーオンリセット回路 |
US7265595B1 (en) * | 2006-03-03 | 2007-09-04 | Cypress Semiconductor Corporation | Stochastic reset circuit |
JP2008040543A (ja) | 2006-08-01 | 2008-02-21 | Renesas Technology Corp | 半導体集積回路 |
JP4531020B2 (ja) | 2006-08-01 | 2010-08-25 | ルネサスエレクトロニクス株式会社 | 半導体集積回路 |
US20080158220A1 (en) * | 2007-01-03 | 2008-07-03 | Himax Technologies Limited | Power-on-reset circuit and method therefor |
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---|---|---|---|---|
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