JP2006065643A - Semiconductor integrated circuit device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the number of pins which a user can use effectively. <P>SOLUTION: A microcomputer 1 is controlled to return to a normal operation mode from a low power consumption mode when a return instruction signal is given to an input/output terminal 1a in the low power consumption mode. In the normal operation mode, the input/output terminal 1a can be shared to be used in a forced return use and a user data input/output use, since the input/output control of user data is carried out through the input/output terminal 1a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a semiconductor integrated circuit device having a plurality of modes.

  For example, Patent Documents 1 and 2 disclose semiconductor integrated circuit devices typified by this type of microcomputer. The semiconductor integrated circuits disclosed in Patent Documents 1 and 2 have a normal operation mode and a test mode, and a dedicated test mode input terminal is provided to switch between the normal operation mode and the test mode. With such a configuration, when a manufacturer tests a semiconductor integrated circuit, the test can be performed by switching the mode of the semiconductor integrated circuit device.

In this case, when the test mode is ended and the normal operation mode is operated, the test mode dedicated input terminal becomes unnecessary. Therefore, in the configuration disclosed in Patent Document 1, the test mode dedicated input terminal is used as a pin for inputting a signal required in the test mode, and data is output from the internal circuit portion to the outside of the semiconductor integrated circuit. Used as a pin. Further, in the configuration disclosed in Patent Document 2, the input terminal used in the normal operation mode is shared as the input terminal for switching to the test mode, thereby eliminating the need for the test mode dedicated input terminal and eliminating the extra terminals. be able to.
JP-A-9-167828 JP-A-9-171060

  Incidentally, in recent years, in such semiconductor integrated circuits, particularly microcomputers, the number of pins that can be used is limited, and it is required to further increase the number of terminals that can be used effectively by users. In particular, attempts have been made to reduce the total number of pins of the microcomputer, and it is desired to increase the ratio of the number of terminals that can be effectively used by the user to the total number of pins. Therefore, even if the number of pins used in the semiconductor integrated circuit is reduced by applying the techniques of Patent Documents 1 and 2, the number of pins used in common in the test mode and the normal operation mode can be increased, but the user can effectively use it. The number of possible terminals cannot be increased. That is, the test mode is generally a mode provided for the manufacturer to test the semiconductor integrated circuit device, and the number of pins cannot be increased so that the user can effectively use it.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a semiconductor integrated circuit device capable of increasing the number of pins that can be effectively utilized by a user.

  According to the first aspect of the present invention, in the semiconductor integrated circuit device having the normal operation mode and the low power consumption mode, when the control means outputs the low power consumption mode switching control signal, the low power consumption mode switching control signal is displayed. Based on this, the switching means switches from the normal operation mode to the low power consumption mode. The return means controls the return from the low power consumption mode to the normal operation mode when the return instruction signal is given to the forced return terminal in the low power consumption mode, and the input / output control means performs the forced return in the normal operation mode. Since the user data is input / output controlled through the terminals, the user data can be input / output controlled using the forced recovery terminal, and the number of pins that can be effectively used by the user can be increased.

  Furthermore, there is a demand for a power window device for a door provided in a vehicle (for example, an automobile) to normally operate the power window only for a short time after the engine is stopped. At this time, if the normal operation of the power window device is maintained even after the engine is stopped, the current consumption is large and the battery is consumed heavily. Conversely, if the system is stopped until an operation input is performed on the power window device, there is a problem that it takes time from the operation input to the actual operation. Therefore, it is desirable that the system waits in a state where the current consumption is suppressed and the low power consumption mode is set instead of stopping the system.

  That is, as in the invention described in claim 2, by providing the semiconductor integrated circuit device according to claim 1 in the power window device of the door provided in the vehicle, the return means is the operating means provided in the vehicle. After the control command is returned from the low power consumption mode to the normal operation mode by giving an operation instruction signal from the terminal for forced return from the control terminal, the control means actually operates from the operation input to control the power window device in the normal operation mode. Power window control can be performed without taking the time until. When used in a system that does not require a forced recovery terminal, such as engine control that switches on and off with an ignition switch, the forced recovery terminal can be effectively used as an input / output terminal. Also play.

An embodiment in which the present invention is applied to a microcomputer will be described below with reference to FIG.
FIG. 1 schematically shows a block configuration in the microcomputer.
In FIG. 1, a microcomputer 1 as a semiconductor integrated circuit device includes a CPU 2, ROM 3, RAM 4 as control means, switching means and return means, an input / output control circuit 5 as input / output control means, a wake-up control circuit 6, And a change-over switch 7. The CPU 2 is configured to operate based on an operation program stored in the ROM 3 or RAM 4. The microcomputer 1 includes an input / output terminal 1a, and inputs / outputs data through the input / output terminal 1a (forced return terminal, mode switching and data input / output terminal).

  The microcomputer 1 is provided with a plurality of modes (normal operation mode and low power consumption mode), and the microcomputer 1 operates in any mode. Of these, in the normal operation mode, the microcomputer 1 performs a predetermined normal operation based on a program stored in the ROM 3 or RAM 4. The microcomputer 1 is mounted on a vehicle and is provided mainly for controlling a power window device (not shown). This power window device is provided to automatically open and close the door window, and during normal operation, an operation instruction signal is input from the operation switch (corresponding to the operation means: not shown) to the input / output terminal 1a and the input / output control When given to the CPU 2 through the circuit 5, the door window is opened and closed based on the control of the CPU 2.

In the low power consumption mode, the microcomputer 1 lowers the power consumption than in the normal operation mode by stopping some functions that operate in the normal operation mode.
Specifically, there are the following cases. That is, there is a demand for a door window power window device provided in the vehicle to operate the door window as usual only for a predetermined period after the engine is stopped. At this time, if the normal operation of the power window device is maintained even after the engine is stopped, the current consumption is large and the battery is consumed heavily. On the contrary, if the power window device is stopped until the operation input to the power window device is performed, it takes a long time from the operation input to the actual operation. Therefore, it is desirable to make the CPU 2 stand by in a state where the current consumption is suppressed and the low power consumption mode is set.

  This mode switching is performed mainly by the CPU 2. When the CPU 2 switches the mode from the normal operation mode to the low power consumption mode, for example, a low power consumption mode input command is generated and given to the changeover switch 7 after a predetermined time has elapsed since the operation instruction signal is not given from the input / output control circuit 5. It is like that. Conversely, when the CPU 2 switches from the low power consumption mode to the normal operation mode, a normal operation mode input command is generated and given to the changeover switch 7.

When the normal operation mode switching control signal is given from the CPU 1, the selector switch 7 switches the input / output terminal 1 a and the input / output control circuit 5 so as to be electrically connected. On the contrary, when the low power consumption mode switching control signal is given from the CPU 1, the selector switch 7 switches the input / output terminal 1a and the wakeup control circuit 6 so as to be electrically connected.
The input / output control circuit 5 is interposed between the CPU 2 and the outside to control data input / output. The wakeup control circuit 6 gives a wakeup signal (return instruction signal) to the CPU 2 when a forced wakeup command signal is given from the outside through the input / output terminal 1a in the low power consumption mode. The wake-up control circuit 6 gives a wake-up signal to the CPU 2 when an operation instruction signal is given from the operation switch (not shown) through the input / output terminal 1a in the low power consumption mode. When a wake-up signal is given from the wake-up control circuit 6, the CPU 2 switches the mode from the low power consumption mode to the normal operation mode, and controls to return to the normal operation mode.

  As described above, according to the present embodiment, when a return instruction signal is given to the input / output terminal 1a in the low power consumption mode, the return control is performed from the low power consumption mode to the normal operation mode, and in the normal operation mode, the input / output terminal is controlled. Since the user data is input / output controlled through 1a, the input / output terminal 1a can be used in common for the purpose of forced recovery and user data input / output, and the number of pins that can be effectively used by the user can be increased.

In addition, after the operation instruction signal is given from the operation switch through the input / output terminal 1a, the CPU 2 receives the operation input from the operation switch (not shown) in order to control the power window device after returning to the normal operation mode. The door window can be controlled to open and close without taking time until the power window device actually operates.
Although the embodiment in which the microcomputer 1 is mounted in a vehicle having a power window device has been described, the present invention is not limited to this, and any semiconductor integrated circuit having a low power consumption mode and a normal operation mode You may apply to an apparatus.

1 is a schematic block diagram showing an embodiment of the present invention.

Explanation of symbols

In the drawings, 1 is a microcomputer (semiconductor integrated circuit device), 1a is an input / output terminal (forced return terminal), 2 is a CPU (switching means, control means, return means), and 5 is an input / output control circuit (input / output control). Means), 6 is a wake-up control circuit, and 7 is a changeover switch.

Claims (2)

A normal operation mode for normal operation, and a low power consumption mode for lowering power consumption than the normal operation mode by stopping some functions that normally operate in the normal operation mode,
A terminal for forced recovery,
Control means for outputting a low power consumption mode switching control signal;
Switching means for switching from the normal operation mode to the low power consumption mode based on a low power consumption mode switching control signal of the control means;
In the low power consumption mode, when a return instruction signal is given to the forced return terminal, return means for controlling the return from the low power consumption mode to the normal operation mode;
A semiconductor integrated circuit device comprising: input / output control means for controlling input / output of user data through the forced return terminal in the normal operation mode. Installed in a vehicle equipped with power window equipment,
The return means is controlled to return from the low power consumption mode to the normal operation mode by receiving an operation instruction signal from the operation means provided in the vehicle through the forced return terminal.
2. The semiconductor integrated circuit device according to claim 1, wherein the control unit controls the power window device in a normal operation mode.

Images