JPS63170712A - Voltage supply control system - Google Patents

Abstract

PURPOSE:To reduce an unnecessary current consumption by controlling supply of a supply voltage to a function block by a voltage supply control means which supplies or stops the supply voltage to the function block in accordance with the control signal from a central processing unit to the function block. CONSTITUTION:When a CPU 1 uses a communication block 2, a status STASO of the communication block 2 is read out from a bus buffer 49 of a voltage supply control circuit 4 for the purpose of confirming the status of the block 2. In the case of the start of the use, a connection/disconnection signal IOBLO to the communication block 2 is outputted to a control circuit 4 to supply a supply voltage Vcc through a flip flop 41, a buffer 43, and a transistor TR 47. In the case of the end of the use, the signal IOBLO is outputted to the voltage supply control circuit 4 to stop the supply of the supply voltage Vcc through the flip flop 41, the buffer 43, and the TR 47. Thus, an unnecessary current consumption is reduced because power is consumed in only the function block required at an optional time.

Description

[Detailed description of the invention] 1 Five Lights! The present invention relates to a voltage supply Il control method, and particularly to a voltage supply control method for an information processing system that performs program control using a central processing unit (hereinafter referred to as CPU).

Conventionally, this type of information processing system has been integrated with input/output devices such as communication function plotters for the purpose of versatility, ease of use, and miniaturization of the entire device. However, as shown in FIG. 4, the CPU 1, communication block 2, and built-in printer 3 are each connected to the power supply voltage Vcc, and the actual operating time of these input/output devices (communication block 2 and built-in printer 3) is short. Despite this, the power supply voltage ■CC for all input/output devices while in constant use
is supplied.

In such conventional information processing systems, the power supply voltage Vcc is supplied to all input/output devices under constant use, even though the actual operating time of the integrated input/output devices is short. As a result, wasteful current consumption increases, and the amount of heat generated by these input/output devices increases accordingly, which poses a problem in that it is a restriction on miniaturization of the entire system device.

The present invention has been made to eliminate the drawbacks of the conventional ones as described above, and can reduce unnecessary current consumption.
The purpose of this invention is to provide a voltage supply control method that is effective for downsizing the entire device.

Composition of the Invention The voltage supply control method according to the present invention is a voltage supply control method for an information processing system configured by a central processing unit and a functional block controlled by the central processing unit, wherein A voltage supply control means for supplying and stopping the voltage is provided, and the voltage supply control means controls the supply of the power supply voltage to the functional block in response to a control signal from the central processing unit to the functional block. It is characterized by the following.

Emperor X 1 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, an information processing system according to an embodiment of the present invention is C
It is composed of a PLJ1, a communication block 2, a built-in printer 3, and a voltage supply control circuit 4.

FIG. 2 is a circuit diagram showing the configuration of the voltage supply control circuit 4 of FIG. 1. In the figure, the voltage supply control circuit 4 has a configuration for managing the communication block 2 and the built-in printer 3, and includes flips 70 and tabs 41 and 42 provided corresponding to the communication block 2 and the built-in printer 3, respectively. , the buffers 43, 44, and the buffers 43 and 44 drive the power supply voltage VC to the communication block 2 and built-in printer 3.
Transistors 47 and 48 supply and stop C, and bias 1! It is composed of resistances 45 and 46 for current setting, and a path buffer 49 that notifies the CPU 1 of the statuses 5TASO and 5TAS1.

Flip-flops 41 and 42 receive connection/disconnection signals 1081 from the CPU 1 to the communication block 2 and built-in printer 3.
0. The l0BLI is changed and held, and the connection/disconnection signal l0BLO is generated by the write signal l0WRT from the CPU1.
, l0BL1 are written.

The pass buffer 49 is connected to the output signal lines from the flip-flops 41 and 42, and receives the read signal 10 from the CPU 1.
Statuses 5TASO and 5TAS1 are read by 8ED.

FIG. 3 is a flowchart showing the operation of one embodiment of the present invention. The operation of an embodiment of the present invention will be explained using FIGS. 1 to 3.

When the CPU 1 uses the communication block 2, it first reads and confirms the status 5TASO of the communication block 2 from the path buffer 49 of the voltage supply control circuit 4 in order to check the status of the communication block 2 (step 3 in FIG. 11).

The communication block 2 status 5TAS Q checks whether the communication block 2 is to be newly used or not (step 12 in Fig. 3). If it is to be newly used, the power supply voltage VCC is supplied to the communication block 2. Then, a connection/disconnection signal 10BLO to the communication block 2 is output to the voltage supply control circuit 4. This connection/disconnection signal 10BLO is written in a flip-flop 41, which outputs this connection/disconnection signal 10BLO to a buffer 43, and by driving the buffer 43, a power supply voltage Vcc is applied to the communication block 2 via a transistor 47. (Step 13 in Figure 3).

If the communication block 2 is not newly used, check whether the use of the communication block 2 is terminated (step 14 in FIG. 3); if the use of the communication block 2 is terminated, the communication block 2 is terminated. Connect/disconnect signal l0 to communication block 2 to stop the supply of power supply voltage VCC to
BLO is output to the voltage supply control circuit 4. When this connection/disconnection signal 10BLO is input, the flip 70 knob 41.
Power supply voltage Vc via buffer 43 and transistor 47
The supply of c to the communication block 2 is stopped (step 15 in FIG. 3).

If the use of communication block 2 is not finished, step 11
Then, the power supply voltage VCC is continued to be supplied to the communication block 2 until the use ends, or the supply of the power supply voltage VCC is stopped until the next new use occurs.

Although the case where the CPU 1 uses the communication block 2 has been described, the same operation as described above is performed when the built-in printer 3 is used.

In this way, the connection/disconnection signal 10BL0 from CPLJI
.

By controlling the supply of the M applied voltage VCC to the functional blocks (communication block 2 and built-in printer 3) by the voltage supply control circuit 4 according to 10 BLI, the current of only the functional blocks required at any given time can be reduced. Since only a small amount of power is consumed, unnecessary current consumption can be reduced.

In addition, the functional blocks are connected to the power supply voltage V only when they are needed.
Since cc is supplied, the amount of heat generated by the functional block can be suppressed, and restrictions on miniaturization of the entire device are relaxed, which is advantageous for miniaturization.

In one embodiment of the present invention, a system having two functional blocks, the communication block 2 and the built-in printer 3, has been described, but even if the number of functional blocks is increased, the functional block that operates at any given time is Since the increase is not proportional to the increase, it is clear that it is more effective even in a system where the number of functional blocks is increased.

[RlI and Jiang] As explained above, according to the present invention, the voltage supply control means for supplying and stopping the power supply voltage to the functional block according to the control signal from the central processing unit to the functional block supplies the power to the functional block. By controlling the supply of power supply voltage, unnecessary current consumption can be reduced.
This has the effect of being effective in downsizing the entire device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a circuit diagram showing the configuration of the voltage supply control circuit of FIG. 1, and FIG. 3 is a flowchart showing the operation of the embodiment of the present invention. Fourth
The figure is a block diagram showing a conventional example. Explanation of symbols of main parts 1...Central processing unit <cpu>2...
communication block

Claims (1)

[Claims] A voltage supply control method for an information processing system constituted by a central processing unit and a functional block controlled by the central processing unit, the voltage supply control means for supplying and stopping a power supply voltage to the functional block. 1. A voltage supply control method, characterized in that the supply of the power supply voltage to the functional block is controlled by the voltage supply control means in response to a control signal from the central processing unit to the functional block.