JP2012215941A - Semiconductor integrated circuit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the consumption currents of a microcomputer and a control device incorporating the microcomputer in the case of the microcomputer operated with power supplied from a battery turning on/off a load.SOLUTION: An IC 50 includes: a pulse-output information storing-memory 55 for storing the content of pulse-output information from a microcomputer 40; a timer 56 for generating a pulse signal used for causing an LED 70 to perform a flashing operation in accordance with the operation condition of the LED 70 included in the pulse-output information and a pulse-output request; and an output circuit 58 for outputting the pulse signal generated by the timer 56, thereby causing the LED 70 to perform a flashing operation in accordance with the pulse signal. By so doing, the IC 50 causes the LED 70 to perform the flashing operation in accordance with the pulse-output request instruction received from the microcomputer 40, enabling the LED 70 to perform the flashing operation even when the microcomputer 40 is stopped in a low-consumption mode.

Description

  The present invention relates to a semiconductor integrated circuit device that drives a load in accordance with a command of a microcomputer that operates by supplying power from a battery.

  Conventionally, in order to reduce the current consumption of a control device (hereinafter referred to as an ECU) incorporating a battery-operated microcomputer (hereinafter referred to as a microcomputer), the microcomputer operating state is changed to a high speed operation, a low speed operation, an intermittent operation, etc. What is switched is known (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2004-280783

  As described above, in an ECU that is operated by a battery, reduction in current consumption of the ECU is required in order to extend the operation time of the ECU or to reduce the size of the battery. For example, when a signal is output by intermittent operation of the microcomputer (switching between operation and stop) and the LED is blinked, reduction of current consumption of the microcomputer is an issue. This will be described with reference to FIG. 3 and FIG.

  FIG. 3 is an overall configuration diagram of a system for blinking LEDs by a microcomputer. As shown in this figure, the microcomputer 80 operates based on the clock signal generated by the high-speed oscillator 81, and the driver 82 is configured to drive the LED 83 by the signal output of the microcomputer 80.

  The microcomputer 80 is a semiconductor integrated circuit device that includes a CPU, FLASHROM, RAM, and the like (not shown) and blinks the LED 83 in accordance with a program stored in the ROM. The microcomputer 80 alternately outputs a Hi / Low (H / L) signal to the driver 82 in order to cause the LED 83 to blink. FIG. 3 shows an example of one output line.

  The high-speed oscillator 81 is an oscillator that generates a clock signal on the order of several MHz, for example, and is formed of, for example, a piezoelectric element. The driver 82 is a drive circuit that turns on or off the LED 83 based on a signal output from the microcomputer 80. The LED 83 is turned on when, for example, 12V power is supplied.

  In the configuration as described above, as shown in FIG. 4, the high-speed oscillator 81 repeats high-speed oscillation and high-speed oscillation stop every predetermined time. Then, the microcomputer 80 waits for the oscillation to stabilize for a fixed time after the high-speed oscillator 81 starts high-speed oscillation, and outputs a signal for blinking the LED 83 when the oscillation of the high-speed oscillator 81 is stabilized (software operation). That is, the microcomputer 80 outputs a Hi signal (H output) or a Low signal (L output) to the driver 82. On the other hand, the microcomputer 80 is in a mode in which it is stopped during a period when the soft operation is not performed and the current consumption is reduced (soft stop).

  As described above, when the LED 83 blinks, the microcomputer 80 repeats the soft operation and the soft stop, but the soft operation is performed every time the LED 83 is turned on and off, and every time the LED 83 is turned on and off. Every time, the microcomputer 80 and the ECU incorporating the microcomputer 80 consume current. Therefore, further reduction of the current consumption of the ECU is desired. Note that the same reduction in current consumption as above is also desired when the LED 83 is turned on / off at low speed operation.

  In the above description, the example of the blinking operation of the LED 83 is described as the load. However, the current consumption of the microcomputer 80 and the ECU incorporating the microcomputer 80 is not limited to the LED 83 but also when the load is operated by the intermittent operation of the microcomputer 80. Reduction is desired.

  In view of the above points, the present invention provides a semiconductor integrated circuit capable of reducing current consumption of a microcomputer and a control device in which the microcomputer is incorporated when a microcomputer operating by power supply from a battery turns on / off a load. An object is to provide a circuit device.

  In order to achieve the above object, according to the first aspect of the present invention, after the microcomputer (40) that operates by supplying power from the battery issues pulse output information and a pulse output request, the operation is stopped in the low consumption mode. A semiconductor integrated circuit device for causing a load (70) to turn on / off according to pulse output information and pulse output request, and has the following configuration.

  That is, the pulse output information is received from the microcomputer (40), the pulse output information storage means (55) for storing the contents of the pulse output information, and the pulse output information stored in the pulse output information storage means (55). An operation condition of the included load (70) is input, and a pulse generation means (56) for generating a pulse signal for causing the load (70) to be turned ON / OFF according to the operation condition, and a pulse generation means (56) Output means (58) for turning on / off the load (70) in accordance with the pulse signal by outputting the generated pulse signal is provided.

  According to this, since the load (70) is turned on / off according to the pulse output information received from the microcomputer (40) and the RUN of the pulse output request (RUN / stop), the operation and stop of the load (70) are performed. The microcomputer (40) does not have to operate every time. Further, the microcomputer (40) stops the operation after requesting RUN with High in the pulse output request (RUN / stop). Therefore, when the microcomputer (40) that operates by supplying power from the battery causes the load (70) to be turned ON / OFF, the current consumption of the microcomputer (40) and the control device in which the microcomputer (40) is incorporated. Can be reduced.

  The invention according to claim 2 is characterized in that a pulse output request is received from the microcomputer (40) and the pulse signal is continuously output until the pulse output request is canceled.

  As described above, since the microcomputer (40) issues the pulse output information and the request, the microcomputer (40) can turn on and off the load (70), so that the microcomputer (40) is operating. Processing load can be reduced.

  In the third aspect of the present invention, when the microcomputer (40) receives the start control command issued before the operation is stopped, the pulse generating means (56) at a predetermined timing after receiving the start control command. The microcomputer (40) is returned from the low consumption mode to the operating state by outputting a start request signal to the microcomputer (40).

  According to this, even if the microcomputer (40) is in the low consumption mode, the microcomputer (40) can be returned to the operating state again. For this reason, the microcomputer (40) can turn off the load by stopping the pulse output request.

  According to a fourth aspect of the present invention, there is provided a semiconductor integrated circuit device that operates when the operating power is supplied from the power supply circuit (10) that generates the operating power based on the battery power supplied from the battery, Power supply signal means (52) for changing the current capability of the power supply circuit (10) with capability switching function is provided.

  The pulse generation means (56) is characterized in that the current capacity of the power supply circuit (10) is lowered by the power supply signal means (52) while the microcomputer (40) is in the low consumption mode.

  According to this, during the period in which the microcomputer (40) is in the low consumption mode, not only can the consumption current of the control device incorporating the microcomputer (40) be reduced, but also the consumption current of the power supply circuit (10) can be reduced. The effect of reducing the current consumption of the battery can be enhanced.

  In the invention described in claim 5, in the invention described in claim 4, the microcomputer (40) operates by being supplied with the operation power generated by the power supply circuit (10). The pulse generation means (56) lowers the current capability of the power supply circuit (10) with the power supply signal means (52) after the first time has elapsed after receiving the activation control command indicating the stop of operation from the microcomputer (40). On the other hand, when outputting the activation request signal to the microcomputer (40) at a predetermined timing after receiving the activation control command, the current capability of the power supply circuit (10) is set to the second timing before the predetermined timing. It is characterized by letting it return.

  According to this, since the operation power having a large current capability is supplied to the microcomputer (40) until the microcomputer (40) is completely stopped, the operation capability of the microcomputer (40) is reduced. Can be prevented. Further, since the operating power having a large current capability is supplied to the microcomputer (40) before the microcomputer (40) is restored, it is possible to prevent the power supply voltage from being lowered after the microcomputer (40) is restored. .

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

1 is an overall configuration diagram of a system including a pulse output semiconductor integrated circuit device (hereinafter referred to as an IC) according to an embodiment of the present invention. 2 is a timing chart showing the operation content of the system shown in FIG. 1. It is a figure for demonstrating a subject, and is the whole system block diagram for blinking LED by a microcomputer. It is a timing chart for demonstrating the operation | movement which blinks LED by the intermittent operation | movement of the microcomputer shown by FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram of a system including a pulse output IC according to an embodiment of the present invention. This system is, for example, a system that blinks an LED in a vehicle.

  As shown in FIG. 1, the system includes a power supply circuit 10, a high-speed oscillator 20, a low-speed oscillator 30, a microcomputer 40, a pulse output IC 50 (hereinafter referred to as IC 50), a driver 60, an LED 70, It is configured with.

  The power supply circuit 10 is a power supply circuit with a current capability switching function that generates an operation power supply (power supply 2) based on a battery power supply supplied from a battery (power supply 1). The battery is, for example, an in-vehicle battery. According to this, the power supply circuit 10 generates a power supply voltage of 5V from a battery voltage of 12V, for example. The microcomputer 40 and the IC 50 are operated by the operating power supplied from the power supply circuit 10.

  The high-speed oscillator 20 is an element that oscillates when driven by an oscillation circuit of the microcomputer 40. The high-speed oscillator 20 oscillates on the order of several MHz, for example, and is formed of, for example, a piezoelectric element.

  The low-speed oscillator 30 is an element that oscillates when the oscillation circuit of the IC 50 is driven. The low-speed oscillator 30 oscillates, for example, on the order of several kHz, and is constituted by, for example, a piezoelectric element or a CR circuit. 1 shows the low-speed oscillator 30 provided outside the IC 50, the low-speed oscillator 30 may be built in the IC 50.

  The microcomputer 40 is a control circuit device incorporated in, for example, an ECU mounted on a vehicle. The microcomputer 40 oscillates the high-speed oscillator 20 to generate a high-speed clock, and realizes a predetermined function by operating according to the high-speed clock. The predetermined function of the microcomputer 40 refers to the contents of a program built in the microcomputer 40, CPU, FLASHROM, RAM, timer, analog to digital conversion, serial communication, input / output, and the like.

  The microcomputer 40 has a function of turning on / off the LED 70 in the IC 50 by issuing a pulse output request command (RUN / stop) to the IC 50. When stopping blinking of the LED 70, the microcomputer 40 cancels (stops) the pulse output request. Here, “ON / OFF” is a blinking operation that repeatedly drives (lights on) and stops (lights off) the LED 70.

  The IC 50 is a semiconductor integrated circuit device that causes the LED 70 to blink in accordance with a pulse output request from the microcomputer 40. Such an IC 50 includes a power supply monitoring circuit 51, a power supply signal circuit 52, an oscillation circuit 53, a transmission / reception circuit 54, a pulse output information storage memory 55, a timer 56, a pulse output state memory 57, and an output circuit 58. And.

  The power monitoring circuit 51 is a circuit that monitors the operating power generated by the power circuit 10. A power-on detection function that detects that the operating power is turned on and a low-voltage detection function that detects that the operating power has become a low voltage lower than a predetermined value are provided.

  When the power supply voltage applied to the IC 50 exceeds a predetermined value, the power supply monitoring circuit 51 sends a reset signal to the power supply signal circuit 52, the transmission / reception circuit 54, the pulse output information storage memory 55, the timer 56, and the pulse output state memory. To 57. Further, when the power supply monitoring circuit 51 detects that the power supply voltage input to the IC 50 is lower than the predetermined value and exceeds the predetermined value again, it outputs a reset signal in the same manner as described above. The power supply monitoring circuit 51 may be externally attached to the IC 50.

  The power signal circuit 52 is a circuit that changes the current capability of the power circuit 10. Specifically, the power supply signal circuit 52 sets the current capability of the power supply circuit 10 to be large when the power supply monitoring circuit 51 detects the above power supply monitoring or when the microcomputer 40 is requested to start. The power supply signal circuit 52 sets the current capability of the power supply circuit 10 to be small when the microcomputer 40 is in the low consumption mode.

  The oscillation circuit 53 is a circuit that oscillates the low-speed oscillator 30 and generates a low-speed clock. The oscillation circuit 53 outputs the generated low-speed clock to the power signal circuit 52, the transmission / reception circuit 54, and the timer 56.

  The transmission / reception circuit 54 is a circuit for performing communication with the microcomputer 40. The microcomputer 40 and the IC 50 are connected by serial communication (synchronous CS, CK, SOUT, SIN), and the microcomputer 50 controls the IC 50. The transmission / reception circuit 54 outputs the signal received from the microcomputer 40 to the pulse output information storage memory 55 for storage. Note that a transmission / reception circuit that can be connected by serial communication other than the above (eg, asynchronous CS, SOUT, SIN) may be used.

  The pulse output information storage memory 55 is a storage means for receiving a signal from the microcomputer 40 via the transmission / reception circuit 54 and storing the contents thereof. The pulse output information storage memory 55 receives the pulse output information from the microcomputer 40, stores the contents of the pulse output information, and outputs the contents to the timer 56. The RUN / stop RUN is a command for blinking the LED 70 with the above output information. Further, the stop of RUN / stop is a command for stopping the blinking of the LED 70.

  The pulse output information includes the period and duty of the pulse signal for causing the LED 70 to blink, the number of output of the pulse signal, the output level before the duty inversion, the start timing (number of times, time), the power signal timing (first time, first time 2 hours) and the like are included.

  The “output level before duty reversal” is a content that indicates whether the start of the blinking operation of the LED 70 starts from turning off (Low) or starting from lighting (Hi). “Start-up timing (number of times, time)” is a content that indicates how many pulses in the period after the IC 50 receives RUN from the microcomputer 40 and after which the microcomputer 40 is returned from the low-consumption mode state. It is. Further, “power supply signal timing” indicates the timing at which the current capability of the power supply circuit 10 is changed after the low consumption mode or before the return of the microcomputer 40.

  The timer 56 performs counting using a low-speed clock, and performs pulse output, counting the number of pulse outputs, starting output to the microcomputer 40, and the like. “Pulse output” is a pulse for causing the timer 56 to input the above operating conditions of the LED 70 included in the pulse output information stored in the pulse output information storage memory 55 and causing the LED 70 to perform a blinking operation in accordance with the operating conditions. This function generates a signal and outputs it to the output circuit 58.

  The pulse output state memory 57 is a storage means for storing the output of the pulse output of the timer 56 or stopping the output and storing the number of output of the pulse output. The pulse output state memory 57 transmits the stored contents to the transmission / reception circuit 54 and transmits it to the microcomputer 40 via the transmission / reception circuit 54. Thereby, the microcomputer 40 can confirm the output state of the IC 50 by communication.

  The output circuit 58 is a circuit that outputs the pulse signal generated by the timer 56 to the driver 60.

  The driver 60 is a drive circuit that blinks the LED 70 in accordance with the pulse signal output from the output circuit 58 of the IC 50. The driver 60 may be built in the IC 50. The LED 70 is a load that blinks when driven by the driver 60.

  The above is an overall configuration diagram of an IC 50 controlled by the microcomputer 40 and a system including the IC 50. In the configuration shown in FIG. 1, for example, a portion excluding the LED 70 is configured as an ECU.

  Next, in the system shown in FIG. 1, the operation of causing the IC 50 to blink the LED 70 when the microcomputer 40 controls the IC 50 will be described with reference to the timing chart of FIG.

  First, when operating power (power supply 2) is supplied from the power supply circuit 10 to the microcomputer 40 and the IC 50 at time T1, the microcomputer 40 and the IC 50 are activated. As a result, the microcomputer 40 enters an oscillation stabilization wait state until the high-speed oscillation of the high-speed oscillator 20 is stabilized. When the high-speed oscillation is stabilized, the microcomputer 40 starts operation.

  Further, the low-speed oscillator 30 starts low-speed oscillation, and thereby the IC 50 also starts operation. In the IC 50, the power monitoring circuit 51 detects power-on, and outputs a reset signal to the power signal circuit 52, the transmission / reception circuit 54, the pulse output information storage memory 55, the timer 56, and the pulse output state memory 57 for resetting. Let The reset is released after a predetermined time.

  Thereafter, when the operation of the microcomputer 40 starts, communication, that is, data transmission / reception is performed between the microcomputer 40 and the IC 50.

  At time T1 to T2, the microcomputer 40 transmits pulse output information for causing the LED 70 to blink by the IC 50. Thereby, the IC 50 stores the contents of the pulse output information in the pulse output information storage memory 55. At time T2, when the microcomputer 40 outputs High to RUN / stop, the timer 56 generates a pulse signal according to the operation condition of the blinking operation stored in the pulse output information storage memory 55, and the driver via the output circuit 58 60. As a result, the driver 60 causes the LED 70 to blink according to the pulse signal.

  For example, if the output level of the pulse signal before the duty inversion is Hi, the output level of the pulse signal output from the output circuit 58 is Hi as shown in FIG. Start.

  Then, as shown in FIG. 2, when the microcomputer 40 outputs High to RUN / stop at time T2, the IC 50 that has received this command continues to generate a pulse signal until the microcomputer 40 outputs Low to RUN / stop. And do it. That is, once the microcomputer 40 outputs RUN for causing the LED 70 to blink, it does not need to perform processing for causing the LED 70 to blink. For this reason, since the microcomputer 40 outputs RUN, the microcomputer 40 can cause the IC 50 to blink the LED 70 even if the operation is not stopped. Therefore, a processing load (soft load) during the operation of the microcomputer 40 is possible. Is reduced.

  At time T3, the microcomputer 40 issues High (command) to the timer 56 of the IC 50 by start control. The activation control command is a command for causing the IC 50 to return (activate) the microcomputer 40 because the operation of the microcomputer 40 is in the low consumption mode. Therefore, the activation control command includes information on the number of times the LED 70 is turned on after the activation control command is input to the timer 56 and activation timing after a predetermined time has elapsed. In FIG. 2, for example, when the LED 70 is turned on for the fourth time after the activation control command is issued to the timer 56, a predetermined time after the start of the fourth lighting is set as the activation timing (time T5).

  As described above, when the microcomputer 40 enters the low consumption mode after the time point T3, the microcomputer 40 does not need to operate every time the LED 70 blinks, so that the current consumption of the microcomputer 40 and the ECU can be reduced.

  On the other hand, the timer 56 starts counting pulses of the pulse signal from time T3 in accordance with the start control command.

  Note that when the operation of the microcomputer 40 enters the low consumption mode after the time T3, the communication between the microcomputer 40 and the IC 50 is also stopped.

  At time T5, since the activation timing has been reached, the timer 56 outputs High (activation) to the microcomputer 40 in response to an activation request for returning the microcomputer 40 from the low consumption mode to the operating state. Thereby, even if the microcomputer 40 is in the low consumption mode, the microcomputer 40 can be returned from the low consumption mode to the operating state at time T5. After the high-speed oscillation of the high-speed oscillator 20 is stabilized, the microcomputer 40 cancels the start-up control at Low at time T6.

  Of course, since the RUN / stop high (RUN) of the microcomputer 40 has not yet been released at the time T5, the IC 50 continues to blink the LED 70.

  After this, when the power supply voltage of the operating power supply (power supply 2) supplied to the microcomputer 40 and the IC 50 at time T7 falls below a predetermined value, the power monitoring circuit 51 of the IC 50 detects power-on as at time T1. , The IC 50 is reset. The microcomputer 40 is similarly reset. The low-speed oscillator 30 also stops operating when the power supply voltage drops.

  Then, since the microcomputer 40 is reset at time T7, the RUN / stop that the microcomputer 40 issued to the IC 50 becomes Low. As a result, the output of the output circuit 58 of the IC 50 becomes Low, and the blinking operation of the LED 70 is also stopped.

  When the power supply voltage exceeds a predetermined value at time T8 and the reset is released, the same operation as that after time T1 is performed.

  2 shows an example in which the RUN / stop becomes Low due to a decrease in the power supply voltage of the operating power supply (power supply 2). However, the LED 70 is turned off by setting the RUN / stop that the microcomputer 40 has output to the IC 50 to Low. It is normal to stop the blinking operation.

  Next, an operation in which the timer 56 causes the power supply signal circuit 52 to lower the current capability of the power supply circuit 10 in the IC 50 while the microcomputer 40 is in the low consumption mode will be described.

  As described above, when the microcomputer 40 issues a high start control to the IC 50 at the time T3, the operation of the microcomputer 40 thereafter becomes the low consumption mode. Therefore, the microcomputer 40 causes the power supply signal circuit 52 to reduce the current capability of the power supply circuit 10 during the low power consumption mode.

  Specifically, the timer 56 causes the power supply signal circuit 52 to reduce the current capability of the power supply circuit 10 after a first time has elapsed since receiving High from the microcomputer 40 at time T3. That is, the power supply signal circuit 52 reduces the current capability of the power supply circuit 10 after the first time has elapsed from the time T3. This is because if the current capability of the power supply circuit 10 is lowered before the microcomputer 40 enters the low consumption mode, the power supply voltage of the microcomputer 40 is lowered. Until this occurs (that is, until the first time elapses after time T3), stable operating power is supplied to the microcomputer 40 without reducing the current capability of the power supply circuit 10. Note that the timing after the first time has elapsed from time T3 (time T4) is the power supply signal timing for reducing the current capability.

  Subsequently, when the timer 56 outputs High in response to the activation request to the microcomputer 40 at the activation timing (time T5) after receiving the activation control High, the timer 56 supplies the power supply signal circuit 52 with the activation timing. Two hours ago, the current capability of the power supply circuit 10 is restored. That is, the power supply signal circuit 52 makes the current capability of the power supply circuit 10 larger than the current capability before the second time before the second time from the time point T5. This is to prevent a situation in which stable operating power cannot be supplied to the microcomputer 40 before the microcomputer 40 is restored, contrary to the above. As a result, stable operating power is supplied to the microcomputer 40 before the microcomputer 40 is restored, and a reduction in power supply voltage after the microcomputer 40 is restored can be prevented. The timing before the second time from the time T5 is the power supply signal timing for increasing the current capability.

  Thus, by reducing the current capability of the power supply circuit 10 after the microcomputer 40 enters the low consumption mode, the current consumption of the power supply circuit 10 can be reduced, and the effect of reducing the current consumption of the battery can be enhanced.

  As described above, when the LED 70 blinks, the blinking operation of the LED 70 is realized not by the microcomputer 40 alone but by the IC 50 that operates even when the microcomputer 40 enters the low consumption mode. It is characterized by.

  That is, as described above, since the LED 50 blinks according to the pulse output information received from the microcomputer 40 by the IC 50 and the RUN / stop high, the microcomputer 40 does not have to operate each time the LED 70 is turned on or off. . For this reason, the load process of the microcomputer 40 can be reduced during the operation of the microcomputer 40, and the current consumption of the microcomputer 40 and the ECU can be reduced.

  Also, since the microcomputer 40 continues the blinking operation of the LED 70 after outputting RUN / stop High once, even if the microcomputer 40 enters the low consumption mode or does not enter the low consumption mode. In addition, the blinking operation of the LED 70 can be continued. Therefore, when the microcomputer 40 is not in the low consumption mode, the processing load of the microcomputer 40 can be reduced, and when the microcomputer 40 is in the low consumption mode, the current consumption of the microcomputer 40 and the ECU can be reduced.

  As described above, when the microcomputer 40 causes the LED 70 to perform the blinking operation, the consumption current of the microcomputer 40 and the ECU in which the microcomputer 40 is incorporated can be reduced by causing the IC 50 to perform the blinking operation.

  Since the IC 50 is operated based on the low-speed oscillation of the low-speed oscillator 30, the IC 50 can be operated with a low-speed clock that can reduce current consumption.

  Furthermore, since the IC 50 reduces the current capability of the power supply circuit 10 during the period in which the microcomputer 40 is in the low consumption mode, not only the current consumption of the microcomputer 40 but also the current consumption of the power supply circuit 10 can be reduced. Therefore, the effect of reducing the current consumption of the entire ECU can be enhanced.

  As for the correspondence between the description of the present embodiment and the description of the claims, the pulse output information storage memory 55 corresponds to the “pulse output information storage means” of the claims, and the timer 56 claims Corresponds to the “pulse generation means” in the range. The output circuit 58 corresponds to “output means” in the claims, and the power signal circuit 52 corresponds to “power signal means” in the claims. Furthermore, the activation timing corresponds to “predetermined timing” in the claims, and the LED 70 corresponds to “load” in the claims.

(Other embodiments)
The configuration of the IC 50 shown in each of the above embodiments is an example, and the configuration is not limited to the configuration shown above, and other configurations including the features of the present invention may be adopted.

  In the above description, the system that blinks and drives the LED 70 of the vehicle has been described as an example. However, this is only an example, and the present invention is not limited to being mounted on a vehicle, and can be applied to a device that repeatedly drives and stops a load. Of course, the load is not limited to the LED 70, and other electronic components and electronic devices may be used.

10 Power supply circuit 40 Microcomputer 50 Pulse output IC
52 Power Signal Circuit (Power Signal Means)
55 Pulse output information storage memory (pulse output information storage means)
56 Timer (pulse generation means)
58 Output circuit (output means)
70 LED (load)

Claims (5)

After the microcomputer (40) that operates by supplying power from the battery issues pulse output information and a pulse output request and stops operating in the low consumption mode, the load (70) is applied according to the pulse output information and the pulse output request. A semiconductor integrated circuit device that performs ON / OFF,
Pulse output information storage means (55) for receiving the pulse output information from the microcomputer (40) and storing the content of the pulse output information;
An operation condition of the load (70) included in the pulse output information stored in the pulse output information storage means (55) is input, and the load (70) is turned ON / OFF according to the operation condition. Pulse generation means (56) for generating a pulse signal;
Output means (58) for turning on / off the load (70) according to the pulse signal by outputting the pulse signal generated by the pulse generation means (56). A semiconductor integrated circuit device.   The pulse generation means (56) receives the pulse output request from the microcomputer (40) and continuously outputs the pulse signal until the pulse output request is canceled. 2. The semiconductor integrated circuit device according to 1.   When the microcomputer (40) receives an activation control command issued before the operation of the microcomputer (40) is stopped, the pulse generation means (56) has a predetermined timing after receiving the activation control command. 3. The semiconductor integrated circuit device according to claim 1, wherein the microcomputer (40) is returned from the low consumption mode to the operating state by outputting a start request signal. A semiconductor integrated circuit device that operates when the operating power is supplied from a power circuit (10) with a current capability switching function that generates an operating power based on a battery power supplied from the battery,
Power supply signal means (52) for changing the current capability of the power supply circuit (10),
The pulse generation means (56) is characterized in that the current capability of the power supply circuit (10) is lowered by the power supply signal means (52) while the microcomputer (40) is in a low consumption mode. 4. The semiconductor integrated circuit device according to any one of items 3 to 3. The microcomputer (40) operates by being supplied with the operation power generated by the power supply circuit (10).
The pulse generation means (56) is configured to cause the power supply signal means (52) to turn on the power supply circuit (10) after a first time has elapsed after receiving an activation control command indicating a stop of operation from the microcomputer (40). While the current capacity is lowered, the power supply circuit is output a second time before the predetermined timing when the activation request signal is output to the microcomputer (40) at the predetermined timing after receiving the activation control command. 5. The semiconductor integrated circuit device according to claim 4, wherein the current capability of (10) is restored.

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