JP2011070309A - Switch state detection device and processing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switch state detection device and processing system with high versatility, capable of reducing power consumption of a processing device without returning the processing device from a sleep state needlessly, and capable of properly setting conditions for reporting to the processing device every switch. <P>SOLUTION: The switch state detection device 1 detects an on/off-state of a switch 5, and outputs a trigger signal to a microcomputer 3 from the switch state detection device 1 in response to change in a switch state meeting the trigger conditions which are set. The microcomputer 3 sets conditions for output of a trigger signal to the switch state detection device 1 by switch 5. The microcomputer 3 returns to a normal state from a sleep state on receiving the trigger signal from the switch state detection device 1, and receives a state of each switch 5 from the switch state detection device 1 to perform processing corresponding to the switch state. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a switch state detection device that detects a state of a plurality of switches and transmits the detected state to another device such as a processing device, and a processing system using the switch state detection device.

  2. Description of the Related Art Conventionally, electronic devices have been provided with a plurality of switches for accepting user operations, and a processing device such as a CPU (Central Processing Unit) or MPU (Micro Processing Unit) mounted on the electronic device is in the state of the switch. And processing according to the user's operation. The same applies to electronic devices (hereinafter referred to as in-vehicle devices) such as an ECU (Electronic Control Unit) mounted on the vehicle, and the processing is performed by detecting the states of a plurality of switches provided in the vehicle. However, it is necessary for the in-vehicle device to detect the switch state even when the vehicle (engine) is stopped. In this case, the battery power is consumed so that the battery does not run out. It is desirable to suppress power.

  Therefore, it is conceivable that the switch state detection is performed by a device (switch state detection device) different from the processing device such as the CPU or MPU, and the processing device is not operated in the sleep state while the vehicle is stopped. The switch state detection device can be realized as a custom IC (Integrated Circuit), for example, and can easily reduce power consumption compared to a processing device such as a CPU or MPU. For this reason, the power consumption of the battery can be reduced by maintaining the processing device in the sleep state as much as possible while the vehicle is stopped and detecting the switch state only by the switch state detection device.

  Patent Document 1 proposes a port sampling circuit device that can reduce a burden on a CPU (Central Processing Unit) accompanying sampling processing. The port sampling circuit device periodically changes the output level of the output port based on the sampling period set in the register by the CPU, and applies it to the input port based on the timing signal starting from the change of the output level. Data to be latched and stored in the data register. Thus, the CPU does not need to perform processing related to sampling, and can read data from the data register at an appropriate timing.

  Patent Document 2 proposes an A / D conversion data input system that inputs A / D conversion data using an A / D converter provided outside a microcomputer while reducing power consumption as much as possible. In this system, a port sampling circuit provided in the microcomputer controls the A / D converter instead of the CPU. The port sampling circuit compares the data sampled and stored in the data register with preset expected value data, and outputs a wakeup signal to the CPU when the two data do not match. As a result, the CPU does not need to wake up periodically for control of the A / D converter and input sampling processing.

JP 2003-296292 A JP 2004-234463 A

  As described above, when the switch state detection device detects the on / off state of the switch, the processing device does not need to detect the switch state and can maintain the sleep state. At this time, the switch state detection device determines whether or not the switch state has changed, and notifies the processing device by an interrupt signal or the like when the switch state changes, so that the processing device returns from the sleep state. In addition, it is possible to perform processing according to changes in the switch state.

  However, the type of switch or the processing content performed for the switch operation is different for each switch. For this reason, some switches do not require the processing device to perform processing even when the switch state changes, that is, it is not necessary to return from the sleep state. In addition, depending on the switch, the processing device performs processing only under specific conditions (for example, only when the state changes from the off state to the on state, or only when the state changes from the on state to the off state). Some do not need to be done. Therefore, when the switch state detection device is configured to uniformly notify the processing device of changes in the switch state for all switches, there is a problem that the processing device unnecessarily returns from the sleep state. Due to this problem, the power consumption of the CPU is hindered, which may increase the power consumption of an electronic device such as an ECU.

  The port sampling circuit described in Patent Document 1 is a configuration in which the CPU reads sampled data at an appropriate timing by itself, and does not have a function for the port sampling circuit to notify the CPU of data changes, and is sampled. Since it is necessary for the CPU to determine whether the data has changed, the CPU cannot enter the sleep state. Therefore, the port sampling circuit of Patent Document 1 cannot solve the above-described problem that the processing device unnecessarily returns from the sleep state.

  The A / D conversion data input system described in Patent Document 2 has a configuration in which the port sampling circuit outputs a wake-up signal to the CPU when the sampled data and the expected value data do not match, and the expected value for each input port. Data can be set. However, since the port sampling circuit is configured to output a wakeup signal only when both data do not match, for example, when the sampling data changes from a state that does not match the expected value data to a state that matches, the wakeup signal Cannot be output. Therefore, the A / D conversion data input system of Patent Document 2 has a problem that the output of the wakeup signal can be performed only when a mismatch between the two data occurs, and the versatility is low.

  The present invention has been made in view of such circumstances, and an object of the present invention is to reduce power consumption by the processing device without unnecessarily returning the processing device from the sleep state, and to switch It is an object of the present invention to provide a highly versatile switch state detection device and processing system capable of appropriately setting conditions for notifying the processing device every time.

  The switch state detection device according to the present invention includes a detection unit that detects the states of a plurality of switches, a transmission unit that transmits the state of each switch detected by the detection unit to another device, and a change in the state of each switch. A determination unit for determining the presence or absence of a switch, a notification unit for notifying the other device when a switch state is changed, and a condition for storing a switch state change condition for notification by the notification unit for each switch It is characterized by comprising storage means and receiving means for receiving the condition from the other device.

  In the switch state detection device according to the present invention, the condition is a condition for notifying only when a target switch changes from an on state to an off state, or the target switch changes from an off state to an on state. It is a condition that a notification is made only in a case.

  In the switch state detection device according to the present invention, the condition is a condition for performing notification in both cases where the target switch changes from an on state to an off state or when the target switch changes from an off state to an on state, or It is a condition that notification is not performed even when the target switch changes.

  The switch state detection apparatus according to the present invention is characterized in that the transmission means and the reception means transmit and receive information to and from the other apparatus by serial communication.

  The switch state detection device according to the present invention further includes switch state storage means for storing the state of each switch detected by the detection means, and the transmission means reads out the state stored in the switch state storage means. And transmitting to the other apparatus.

  The switch state detection device according to the present invention is characterized in that the condition storage means and the switch state storage means are constituted by a common storage element.

  The processing system according to the present invention is a processing system including a processing device that performs processing according to a plurality of switch states, and a switch state detection device that detects the state of the switch and transmits the detected state to the processing device. The switch state detection device includes a detection unit that detects the state of each switch, a transmission unit that transmits the state of each switch detected by the detection unit to the processing device, and whether there is a change in the state of each switch. Determining means for determining whether the switch state has changed, a notifying means for notifying the processing device, and a condition storage means for storing, for each switch, a condition for changing the switch state to be notified by the notifying means. Receiving means for receiving the condition from the processing device, wherein the processing device performs processing according to the state of the switch, or performs the processing. Rather, operating in a low power consumption state with less power consumption than the processing operation state, and according to the notification from the switch state detection device, the transmission means for transmitting the condition to the switch state detection device, Switching means for switching the state from the processing operation state to the low power consumption state, receiving means for receiving the state of each switch transmitted by the switch state detection device in the processing operation state, and each of the reception means received And processing means for performing processing according to the state of the switch.

In the present invention, the switch state detection device detects the on / off states of a plurality of switches, and transmits the state of each switch to the processing device. When the switch state changes, the processing device returns to the processing device. Notification of. Thereby, the processing device does not need to detect the switch state, and when the switch state is changed, the processing is performed for the switch operation from the low power consumption state (sleep state) according to the notification from the switch state detection device. The operation state (normal state) can be entered, and the switch state can be received and processed from the switch state detection device.
Further, the switch state detection device stores a condition for notifying a change in the switch state for each switch. Even when the switch state changes, if the stored condition is not met, the switch state detection device does not notify the processing device, but only notifies when the condition is met. The conditions for each switch can be set by transmitting from the processing device to the switch state detection device.
Thereby, according to the type or processing content of each switch, the notification regarding the change of the switch state from the switch state detection device to the processing device can be performed under different conditions. Therefore, the versatility of the processing system is improved, unnecessary notification to the processing device does not occur, and the processing device can maintain the sleep state and reduce power consumption.

  Further, in the present invention, a switch state detection device is provided with a condition for notifying only when the switch changes from the on state to the off state, or a condition for notifying only when the switch changes from the off state to the on state. Can be set. As a result, notification from the switch state detection device to the processing device is performed only for a unidirectional state change from the off state to the on state, or from the on state to the off state, and unnecessary notification to the processing device. It can be prevented from occurring.

  Further, in the present invention, the switch state detection device is provided with a condition for notifying the switch state change at any time when the switch changes to the on state or the off state. Can be set. As a result, the processing device can always perform processing in response to a change in the switch state, and the processing device can be configured to perform no processing in response to an unnecessary change in the switch state. The versatility of the system can be improved.

  In the present invention, transmission of the switch state from the switch state detection device to the processing device and transmission of the notification condition from the processing device to the switch state detection device are performed by serial communication. Note that when the switch state detection device notifies the processing device of a change in the switch state, the notification may be performed by a communication method different from these. Thereby, data transmission / reception between the switch state detection device and the processing device can be performed efficiently, and the number of wirings can be reduced.

  Also, in the present invention, the switch state detection device stores the detected state of each switch in a memory or the like, and reads and transmits the state of each switch from the memory when communicating with the processing device. Thereby, the switch state detected when the processing device is in the sleep state or the like is stored, and the switch state can be transmitted after the processing device returns from the sleep state to the normal state.

  In the present invention, the condition for notifying the switch state change received from the processing device and the detected state of each switch are stored in a common storage element. As a result, data transmitted and received between the switch state detection device and the processing device can be stored in a common storage element, so that the communication circuit in the switch state detection device can easily read and write data, and effectively use the storage element. Can do.

  In the case of the present invention, the switch state detection device stores the condition for notifying the processing device of the change of the switch state for each switch, and only when the switch state is changed and this change corresponds to the notification condition. By adopting a configuration for performing notification, notification regarding changes in the state of each switch can be performed under different conditions according to the type or processing content of each switch, thereby improving the versatility of the processing system. Unnecessary notification to the processing device does not occur. Therefore, since the processing device is not unnecessarily restored from the sleep state, the processing device can maintain the sleep state and reduce power consumption. Moreover, since the conditions for notifying the processing device for each switch can be set appropriately, the versatility of the processing system can be improved.

It is a block diagram which shows the structure of the processing system which concerns on this invention. It is a block diagram which shows the structure of the processing system which concerns on this invention. It is a schematic diagram for demonstrating trigger condition setting. It is a flowchart which shows the procedure of the switch state detection process which the switch state detection apparatus of the processing system which concerns on this invention performs. It is a flowchart which shows the procedure of the trigger condition setting process which the microcomputer of the processing system which concerns on this invention performs. It is a flowchart which shows the procedure of the trigger condition reception process which the switch state detection apparatus of the processing system which concerns on this invention performs. It is a flowchart which shows the procedure of the control processing according to the switch state which the microcomputer of the processing system which concerns on this invention performs.

  Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof. 1 and 2 are block diagrams showing the configuration of a processing system according to the present invention. FIG. 1 shows details of the switch state detection device 1 and FIG. 2 shows details of a microcomputer (processing device) 3. . In the illustrated processing system, the switch state detection device 1 detects an operation on a plurality of (three in FIG. 1) switches 5, and the microcomputer 3 performs control processing of the controlled device 9 according to the detection result. is there. For example, when the controlled device 9 is an audio device, the switch 5 is a switch that receives operations such as volume setting or music selection.

  In the present embodiment, the switch 5 is a one-contact switch such as a push switch, for example, and is in an on state or an off state. Each switch 5 gives a signal indicating its own switch state to the switch state detection device.

  The switch state detection device 1 includes a plurality of detection units 11 and a determination unit 12, a trigger signal generation unit 13, a storage unit 14, and a serial communication unit 15. A signal indicating the switch state of each switch 5 is input to each of the plurality of detection units 11 of the switch state detection device 1. The detection unit 11 is provided in the switch state detection device 1 in the same number as or more than the number of the switches 5, and a signal from one switch 5 is input to one detection unit 11. Each detection unit 11 constantly or periodically monitors the input signal from each switch 5 and detects the switch state of each switch 5 according to the signal level of the input signal. For example, the detection unit 11 determines that the switch 5 is in an off state if the input signal is at a high level (signal level equal to or higher than the threshold value), and if the input signal is at a low level (signal level equal to or lower than the threshold value), the switch 5 It can be determined that the state is on. Each detection unit 11 outputs the detected switch state of each switch 5 to the determination unit 12 and stores it in the storage unit 14 as digital data.

  The same number of determination units 12 as the detection units 11 are provided in the switch state detection device 1, and one detection unit 11 and one determination unit 12 are associated with each other. The determination unit 12 determines whether a change has occurred in the switch state of the switch 5 based on the switch state of the switch 5 given from the detection unit 11. For example, the determination unit 12 may be configured to determine whether there is a change in the switch state by comparing the switch state input from the detection unit 11 with the switch state input before (immediately before). Further, for example, the determination unit 12 can be configured to determine whether there is a change in the switch state by detecting a rising edge or a falling edge of the input signal input from the detection unit 11.

  In addition, the determination unit 12 is given the trigger condition setting stored in the storage unit 14, and when the change of the switch state corresponds to the set trigger condition, the trigger signal generation unit 13 is instructed to output a trigger signal. give. FIG. 3 is a schematic diagram for explaining the trigger condition setting. The trigger condition is a condition for determining whether or not the switch state detection device 1 outputs a trigger signal to notify the microcomputer 3 when the state of the switch 5 changes. In the processing system according to the present embodiment, the microcomputer 3 can set four illustrated conditions as trigger conditions for the switch state detection device 1. Each trigger condition is individually set in association with each switch 5 as 2-bit digital data.

  The trigger condition “00” is a setting for outputting a trigger signal both when the switch 5 changes from the on state to the off state or when the switch 5 changes from the off state to the on state. The determination unit 12 always gives a trigger signal output command to the trigger signal generation unit 13 when it is determined that the switch state has changed when the trigger condition “00” is given.

  The trigger condition “01” is a setting for outputting a trigger signal only when the switch 5 changes from the off state to the on state. When the determination unit 12 determines that the switch state has changed when the trigger condition “01” is given, the determination unit 12 further determines whether the change in the switch state is a change from the off state to the on state. Then, it is determined whether or not the switch state change satisfies the trigger condition. When the switch state change satisfies the trigger condition, the determination unit 12 gives a trigger signal output command to the trigger signal generation unit 13.

  The trigger condition “10” is a setting for outputting a trigger signal only when the switch 5 changes from the on state to the off state. When the determination unit 12 determines that the switch state has changed when the trigger condition “10” is given, the determination unit 12 further determines whether the change in the switch state is a change from the on state to the off state. Then, it is determined whether or not the switch state change satisfies the trigger condition. When the switch state change satisfies the trigger condition, the determination unit 12 gives a trigger signal output command to the trigger signal generation unit 13.

  The trigger condition “11” is a setting that does not output a trigger signal even when the state of the switch 5 changes. When the trigger condition “11” is given, the determination unit 12 does not determine a change in the switch state and does not give a trigger signal output command to the trigger signal generation unit 13. The trigger condition “11” is, for example, when the number of switches connected to the switch state detection device 1 is smaller than the number of switches that can be detected by the switch state detection device 1, that is, the input of the switch state detection device 1 It can be used for the purpose of invalidating the input from this input port when there is a vacancy in the port. For example, even when the switch 5 is connected, the trigger condition “11” can be set for the switch 5 that does not need to accept an operation according to the operation state of the controlled device 9. .

  As described above, each determination unit 12 determines the change in the state of the switch 5 and further determines whether or not the change in the switch state satisfies the trigger condition. When the trigger condition is satisfied, the determination unit 12 proceeds to the trigger signal generation unit 13. Gives a trigger signal output command. The trigger signal generation unit 13 is given a trigger signal output command from each of the plurality of determination units 12. When a trigger signal output command is given from any of the determination units 12, the trigger signal generation unit 13 generates, for example, a pulse signal having a predetermined pulse width as a trigger signal and outputs it to the microcomputer 3.

  The storage unit 14 is configured by a data rewritable memory element such as a register, SRAM (Static Random Access Memory), or DRAM (Dynamic Random Access Memory). The storage unit 14 stores the state of the switch 5 provided from each of the plurality of detection units 11. The storage unit 14 gives the stored switch state to the serial communication unit 15 in response to a request from the serial communication unit 15.

  The storage unit 14 also stores the above-described trigger condition setting given from the microcomputer 3 via the serial communication unit 15. The trigger condition given from the microcomputer 4 is set for each switch 5, and the storage unit 14 stores a trigger condition corresponding to a storage area predetermined for each switch 5. The storage unit 14 gives a corresponding trigger condition to the determination unit 12 that determines the state change of each switch 5. As described above, the storage unit 14 can store the switch state given from the detection unit 11 and the trigger condition setting given from the serial communication unit 15. In order to store these different types of data, the storage unit 14 has an appropriate storage area for each data, such as an address range.

  The serial communication unit 15 performs serial data transmission / reception with the microcomputer 3. The serial communication between the switch state detection device 1 and the microcomputer 3 may be configured to transmit and receive data using a common communication line. Data transmission from the switch state detection device 1 to the microcomputer 3 and the microcomputer 3 may be configured to perform data transmission from 3 to the switch state detection device 1 using different communication lines. When receiving the trigger condition setting from the microcomputer 3, the serial communication unit 15 stores the received trigger condition setting in a predetermined storage area of the storage unit 14. In response to a request from the microcomputer 3, the serial communication unit 15 reads the switch state from the storage unit 14 and transmits the read switch state to the microcomputer 3.

  The microcomputer 3 includes a control unit 31, a ROM (Read Only Memory) 32, a RAM (Random Access Memory) 33, a serial communication unit 34, an I / F (interface) unit 35, and the like. Specifically, the control unit 31 includes a processing device such as a CPU or an MPU, and performs various types of arithmetic processing, control processing of each unit, and the like. The ROM 32 is configured by a mask ROM, an EEPROM, or the like, and stores various programs and data necessary for the operation of the control unit 31 in advance. The ROM 32 stores an initial value of trigger condition setting for transmission to the switch state detection device 1. The RAM 33 is configured by a data rewritable memory element such as SRAM or DRAM. For example, the control unit 31 performs processing by executing a program stored in the ROM 32, and stores data generated in the calculation process of this processing in the RAM 33.

  The serial communication unit 34 performs serial data transmission / reception with the switch state detection device 1. The serial communication unit 34 transmits the trigger condition setting given from the control unit 31 to the switch state detection device 1. Further, the serial communication unit 34 transmits a switch state transmission request to the switch state detection device 1 under the control of the control unit 31, receives the switch state transmitted by the switch state detection device 1 as a response to the transmission request, and receives the switch state. The switched state is given to the control unit 31.

  The I / F unit 35 is for performing signal input / output or data transmission / reception with the controlled device 9, and is connected to the controlled device 9 via a communication line or the like. The I / F unit 35 converts the control command given from the control unit 31 into a signal or data suitable for the controlled device 9 and outputs the signal or data, and outputs the signal or data input from the controlled device 9 to the control unit 31. Give to. Thereby, the microcomputer 3 can control the operation of the controlled device 9 and can acquire feedback information accompanying the operation.

  Further, the microcomputer 3 is in a normal state (processing operation state) in which the controlled device 9 is controlled in response to the operation of the switch 5 and a sleep state (low power consumption) in which the controlled device 9 is not controlled. Power state). In the normal state, the control unit 31 of the microcomputer 3 performs serial communication with the switch state detection device 1 to receive the switch state, and performs control processing of the controlled device 9 according to the received switch state. After this control process is completed, the control unit 31 switches the microcomputer 3 from the normal state to the sleep state.

  In the sleep state, the operation of each unit is stopped by the stop of the clock of the microcomputer 3 and the control unit 31 is in a state of receiving only the trigger signal from the switch state detection device 1. When the switch state detection device 1 determines that a switch state change that satisfies a preset trigger condition has occurred, a trigger signal is output from the switch state detection device 1 to the control unit 31 of the microcomputer 3. The control unit 31 starts processing by switching the microcomputer 3 from the sleep state to the normal state in response to a trigger signal from the switch state detection device 1, performs serial communication with the switch state detection device 1, acquires the switch state, and Control processing of the controlled device 9 according to the state is performed.

  In this way, the microcomputer 3 performs processing by returning from the sleep state to the normal state when the trigger signal is given from the switch state detection device 1, and after the processing is completed, the microcomputer 3 shifts from the normal state to the sleep state to consume power. Reduce. Even if the microcomputer 3 is in the sleep state, the switch state detection device 1 performs the state detection process of the switch 5, so that the operation of the switch 5 by the user is reliably detected and a trigger signal is output to the microcomputer 3. The microcomputer 3 can be returned from the sleep state to the normal state, and processing corresponding to the switch operation can be performed.

  FIG. 4 is a flowchart showing the procedure of the switch state detection process performed by the switch state detection device 1 of the processing system according to the present invention. The switch state detection device 1 detects whether each switch 5 is in an on state or an off state in each detection unit 11 depending on whether the input signal from the corresponding switch 5 exceeds a threshold value. That is, the switch state is detected (step S1). After the switch state is detected by each detection unit 11, the switch state detection device 1 stores the detected switch state in the storage unit 14 (step S2). In the switch state detection device 1, each determination unit 12 determines whether or not the switch state detected by each detection unit 11 has changed compared to the previous state (step S3), and the switch state has changed. If not (S3: NO), the process returns to step S1, and the above-described steps S1 to S3 are repeated.

  When the switch state is changed (S3: YES), the switch state detection device 1 compares the change of the switch state with the trigger condition given from the storage unit 14 in the corresponding determination unit 12 (Step S1). S4), it is determined whether or not the change of the switch state satisfies the set trigger condition (step S5). If the change in the switch state satisfies the trigger condition (S5: YES), the switch state detection device 1 outputs a trigger signal to the microcomputer 3 in the trigger signal generation unit 13 (step S6), and ends the process. If the change in the switch state does not satisfy the trigger condition (S5: NO), the switch state detection device 1 ends the process without outputting the trigger signal. Note that the switch state detection apparatus 1 periodically repeats the processing of the illustrated flowchart.

  FIG. 5 is a flowchart showing the procedure of the trigger condition setting process performed by the microcomputer 3 of the processing system according to the present invention, which is a process performed by the control unit 31 of the microcomputer 3. Although FIG. 5 shows an example in which the trigger condition is set when the microcomputer 3 is activated after the power is turned on, the timing for setting the trigger condition is not limited to this.

  The control unit 31 of the microcomputer 3 performs a power-on reset process for initializing values of internal registers after power-on (step S21), and reads the trigger condition stored in the ROM 12 after the completion of the process (step S21). Step S22). Next, the control unit 31 gives the read trigger condition to the serial communication unit 34, and transmits the trigger condition to the switch state detection device 1 (step S23). After completing all necessary processes, the control unit 31 shifts the microcomputer 3 to the sleep state (step S24) and ends the process.

  FIG. 6 is a flowchart showing a procedure of trigger condition reception processing performed by the switch state detection device 1 of the processing system according to the present invention. The switch state detection apparatus 1 determines whether or not the trigger condition transmitted from the microcomputer 3 has been received by the serial communication unit 15 (step S31), and when the trigger condition has not been received (S31: NO) ), Wait until the trigger condition is received.

  When the trigger condition is received from the microcomputer 3 (S31: YES), the switch state detection device 1 stores the received trigger condition in the storage unit 14 (step S32). At this time, the switch state detection device 1 stores the trigger condition for each switch 5 in the storage area of the storage unit 14 determined for each switch 5. Next, the switch state detection device 1 applies the trigger condition stored in the storage unit 14 to the corresponding determination unit 12 to reflect the trigger condition received from the microcomputer 3 (step S33), and ends the process.

  FIG. 7 is a flowchart showing the procedure of the control processing according to the switch state performed by the microcomputer 3 of the processing system according to the present invention, and shows the processing when the switch 5 is operated when the microcomputer 3 is in the sleep state. It is. The control unit 31 of the microcomputer 3 determines whether or not a trigger signal is given from the switch state detection device 1 (step S41). When the trigger signal is not given (S41: NO), the trigger signal is given. Wait until you are in sleep.

  When the trigger signal is given from the switch state detection device 1 (S41: YES), the control unit 31 switches the microcomputer 3 from the sleep state to the normal state (step S42), and the serial communication unit 34 detects the switch state. A switch state transmission request is transmitted to the apparatus 1 (step S43).

  Thereafter, the control unit 31 determines whether or not the serial communication unit 34 has received the switch state from the switch state detection device 1 transmitted in response to the switch state transmission request (step S44), and determines the switch state. If not received (S44: NO), it waits until the switch state is received. When the switch state is received from the switch state detection device 1 (S44: YES), the control unit 31 determines the content of the switch operation performed on each switch 5 according to the received switch state (step S45). ), Processing according to the switch operation (control processing for the controlled device 9) is performed (step S46). After this process is completed, the control unit 31 switches the microcomputer 3 from the normal state to the sleep state (step S47) and ends the process.

  In the processing system configured as described above, when the switch state detection device 1 detects the on / off state of the plurality of switches 5 and a change in the switch state that satisfies the set trigger condition occurs, the switch state detection device. By adopting a configuration in which the trigger signal is output from 1 to the microcomputer 3 and the notification is made, the microcomputer 3 does not need to switch from the sleep state to the normal state in order to perform processing related to the detection of the switch state. It is possible to maintain and reduce power consumption. Further, by adopting a configuration in which the microcomputer 3 can set a condition for outputting a trigger signal for each switch 5 (trigger condition) for the switch state detection device 1, the versatility of the processing system is improved and the microcomputer 3 Therefore, the microcomputer 3 can more reliably maintain the sleep state and reduce power consumption.

  In addition, by making it possible to set a trigger condition for outputting a trigger signal when the switch 5 changes from the on state to the off state, or when the switch 5 changes from the off state to the on state, the state change in one direction of the switch 5 can be set. As a result, a trigger signal can be output from the switch state detection device 1 to the microcomputer 3 only for the above, and unnecessary notification to the microcomputer 3 can be prevented. Further, the switch state detection device 1 can be set by setting a trigger condition for outputting a trigger signal in both cases where the switch 5 changes from the off state to the on state and when the switch 5 changes from the on state to the off state. Can always output a trigger signal to the microcomputer 3 in response to a change in the state of the switch 5, and can cause the microcomputer 3 to always perform processing in response to a change in the state of the switch 5. Moreover, even if the switch 5 changes state, a trigger condition that does not output a trigger signal can be set, so that the microcomputer 3 does not return from the sleep state for an unnecessary change in the state of the switch 5 or the like. Thus, a configuration can be adopted in which the process for the controlled device 9 is not performed. Thus, the versatility of the processing system can be improved by adopting a configuration in which the microcomputer 3 can perform a plurality of trigger settings on the switch state detection device 1.

  The switch state detection device 1 stores the state of each switch 5 detected by the detection unit 11 in the storage unit 14 and stores the trigger setting received from the microcomputer 3 in the storage unit 14. Thereby, since the data which the serial communication part 15 transmits / receives between the microcomputers 3 can be memorize | stored in the memory | storage part 14, it is easy for the serial communication part 15 to read / write data, and also utilizes a memory element etc. effectively. Thus, the storage unit 14 can be configured.

  In the present embodiment, the switch 5 is a one-contact push switch. However, the present invention is not limited to this, and the switch state detection device 1 may be configured to detect the switch states of other various switches. Further, the trigger conditions are not limited to the four conditions shown in FIG. 3, and various conditions can be set according to the type of switch connected to the switch state detection device 1. 1 shows a configuration in which the switch state detection device 1 detects the switch states of the three switches 5. However, the present invention is not limited to this, and the number of switch state detection devices 1 is two or less or four or more. The switch state of the switch 5 may be detected. Further, the number of detection units 11 and determination units 12 included in the switch state detection device 1 may not be the same as the number of switches 5, as long as it is larger than the number of switches 5. Further, although the microcomputer 3 is configured to set the trigger condition in the switch state detection device 1 when the power is turned on, the present invention is not limited to this, and the trigger condition may be set at other timings.

1 Switch status detection device 3 Microcomputer (processing device)
5 Switch 9 Controlled device 11 Detection unit (detection means)
12. Determination unit (determination means)
13 Trigger signal generator (notification means)
14 Storage unit (condition storage means, switch state storage means)
15 Serial communication unit (transmission means, reception means)
31 Control unit (switching means, processing means)
34 Serial communication unit (transmission means, reception means)

Claims (7)

Detection means for detecting the state of each of the plurality of switches;
Transmitting means for transmitting the state of each switch detected by the detecting means to another device;
Determining means for determining the presence or absence of a change in the state of each switch;
A notification means for notifying the other device when the state of the switch changes;
A condition storage means for storing, for each switch, a condition of a switch state change to which the notification means notifies;
A switch state detection device comprising: a receiving unit configured to receive the condition from the other device. The condition is
A condition to notify only when the target switch changes from on to off,
Or
The switch state detection device according to claim 1, wherein a notification is made only when a target switch changes from an off state to an on state. The condition is
Conditions for notification in both cases when the target switch changes from on to off or from off to on,
Or
The switch state detection device according to claim 1 or 2, wherein a notification is not made even if the target switch changes. The switch according to any one of claims 1 to 3, wherein the transmission unit and the reception unit transmit and receive information to and from the other device by serial communication. State detection device. Comprising switch state storage means for storing the state of each switch detected by the detection means;
The said transmission means reads the state memorize | stored in the said switch state memory | storage means, It is made to transmit to said other apparatus, The one of Claim 1 thru | or 4 characterized by the above-mentioned. Switch state detection device. The switch state detection device according to claim 5, wherein the condition storage unit and the switch state storage unit are configured by a common storage element. A processing system comprising: a processing device that performs processing according to a state of a plurality of switches; and a switch state detection device that detects the state of the switch and transmits the detected state to the processing device,
The switch state detection device includes:
Detecting means for detecting the state of each switch;
Transmitting means for transmitting the state of each switch detected by the detecting means to the processing device;
Determining means for determining the presence or absence of a change in the state of each switch;
A notification means for notifying the processing device when the state of the switch changes;
A condition storage means for storing, for each switch, a condition of a switch state change to which the notification means notifies;
Receiving means for receiving the condition from the processing device;
The processor is
A processing operation state in which processing according to the state of the switch is performed, or operation in a low power consumption state in which power consumption is less than that in the processing operation state without performing the processing;
Transmitting means for transmitting the condition to the switch state detection device;
Switching means for switching the state from the processing operation state to the low power consumption state in response to a notification from the switch state detection device;
In the processing operation state, receiving means for receiving the state of each switch transmitted by the switch state detection device;
And a processing unit that performs processing according to the state of each switch received by the receiving unit.

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