JPS63137313A - Computer equipment - Google Patents

Abstract

PURPOSE:To reduce the load of processing for power supply voltage drop by software by ORing the state of a specific switch means and an output signal obtained at the time of detecting the drop of a power supply voltage. CONSTITUTION:A ROM3, a RAM4, an I/O circuit 5, and a display memory 6 are connected to a CPU1 through a system bus 2. The CPU1 acts as a deciding means by a program in the RAM3. The I/O circuit 5 including on OR means 5a is connected to the keyboard 7, and a display device 10 is connected to the display memory 6 to constitute an informing means 30. An output voltage of a power supply circuit 12 is detected by a power supply voltage detecting means 11 and a switch means 15 acts as a brake key or the like for indicating the intermission of processing. The OR operation between said output voltage and the output of the switch means 15 is calculated by the OR means 5a, the calculated result is outputted to a deciding means 1 to decide whether the operation of the switch means 15 causes voltage drop or not, and the decided result is informed by the informing means 30.

Description

[Detailed description of the invention] (a) Industrial application field - This invention relates to a computer device capable of executing software for various types of office processing or character processing.
In particular, the computer device is capable of notifying the user of a drop in power supply voltage using a sound.

(b) Prior Art Conventionally, in computer equipment (for example, in a battery-operated portable combinator), when the battery voltage drops, this is notified to the central control unit (hereinafter referred to as CPU) in some form. Measures were taken such as giving a warning to the user.

The methods to be used to inform the public are as follows:
Interrupt the CPU when the voltage drops, do it in the interrupt process, or constantly monitor the voltage drop detection signal,
It is well known to jump to a warning routine when the voltage drops.

(c) Problems to be Solved by the Invention However, the former method utilizes the advanced functions of the CPU, and requires consideration in terms of software.

Furthermore, in the latter case, it is sufficient to monitor the voltage drop detection signal within a certain period of time, but separate software must be prepared just for this purpose.

This invention has been made in view of the above circumstances, and by calculating the logical sum of the state of a specific switch means and the signal output when a power supply voltage drop is detected, software can handle the power supply voltage drop processing. The purpose is to provide a computer device that can be made lighter.

(d) Means for Solving the Problems The present invention is comprised of a switch means that outputs a signal for interrupting the process currently being executed when operated, and a power supply voltage detection means that detects a drop in power supply voltage. , an OR means for calculating the logical sum of the signal output by the switch means and the signal output by the power supply voltage detection means; and a logical sum means for calculating the logical sum of the signal output by the switch means and the signal output by the power supply voltage detection means; This computer device is characterized by comprising a determining means for making a determination at predetermined intervals, and a notifying means for notifying whether processing has been interrupted or a power supply voltage has decreased by a signal output from the determining means.

(e) The operational OR means calculates the logical sum of the signal output by the switch means and the signal output by the power supply voltage detection means when operated, and outputs the result to the determination means. The means of determination is
Based on the result of the logical sum operation, it is determined at predetermined intervals whether the switch means has been operated or the power supply voltage has decreased, and the notification means is informed as to whether the process has been interrupted or the power supply voltage has decreased. Outputs a signal indicating. Based on this output, the notification means makes a corresponding notification, so that the sound used can accurately grasp the current state of the computer device.

(F) EXAMPLES Hereinafter, examples of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the following examples.

In Fig. 1, CPtJ (Central Processing Unit) 1 interprets codes (programs) written in ROM (Memory for Continuous Reading) 3 connected via system bus 2 and performs various calculations. , I10 data access, RAM (
Data can be written to (read/write memory) 4. The CPUI operates as a determining means using a program in the ROM3. In addition to the above, system bus 2 includes:
(2) The 7070 circuit 5 and the display memory 6 are connected. I1
The 0 circuit 5 includes an OR means 5a and is connected to a keyboard 7 for inputting various data and commands, as shown in FIG. The keyboard 7 receives the strobe signal S output from the CPU 1 via the I10 circuit 5 from the line 8, and also receives the response signal A from the line 9. It is output to the CPUI via the I10 circuit 5. A display device 10 is connected to the display memory 6, and a display corresponding to the data written in the display memo IJ 6 is displayed at a position corresponding to the address of the data. As the display device 10, a dot matrix type liquid crystal display device is suitable. The display memory 6 and the display device 10 constitute the notification means 30.

Reference numeral 11 denotes power supply voltage detection means, which detects the output voltage of the power supply circuit 12, and outputs a detection signal of a decrease in the power supply voltage to the OR means 5a in the I10 circuit 5 via a line 13.

Power supply circuit 12, which in this embodiment includes a dry cell battery, provides power via line 14 to all electrical circuits and components, including the CPUI. Reference numeral 15 denotes a switch means which is connected to the power supply circuit 12 through a line 14 and to the I10 circuit 5 through a line 16. The switch means 15 operates as a break key for instructing interruption of processing, and also operates as a power switch. A reset switch 17 outputs a reset signal to the CPU via a line 18 when operated. The reset switch 17 should be operated when replacing the dry batteries.

Next, referring to FIG. 2, the configuration of the logical sum means 5 will be explained.

The OR means 5a includes a 2NAND gate 20 whose input ends are connected to lines 13 and 16, an inverter gate 21 whose input end is connected to line 13, and an inverter gate whose input end is connected to line 18. 22 and the D input is connected to line 2a, which is one of the system bus 2. A flip-flop 23 and an inverter gate 2
A gate 25 outputs the output of 1 to the D input of the flip-flop 23 when the signal 24 is input, and each input terminal is connected to the output terminal of the inverter gate 21, and the Q output of the flip-flop 23 is connected. 2 N
A N D gate 26 and 2 N A N D gate 2
2NAND gate 27 whose respective output terminals of 0 and 26 are connected to respective input terminals;
When the output terminal of the gate 20 and the output terminal of the inverter gate 22 are connected to their respective input terminals, both are constituted by an AND gate 28 whose output terminal is connected to the R input of the flip-flop. 2 N A N D gate 27
The output end of is connected to CPU1 via line 19.

Next, the operation of this embodiment will be explained with reference to FIG.

Normally, the CPU 1 operates according to the contents of the ROM 3, but in order to determine whether or not the user instructs to interrupt the operation of a certain instruction (processing that is currently being executed), the CPU 1 switches the CPU 1 at appropriate time intervals. I go to check the input (operation) state of the means 15. If the switch means 15 is operated, "processing is interrupted"
If , the CPUI interrupts the process currently being executed, and displays an interrupt message on the display device 5 to notify the user that the process has been interrupted. After this, the CPUI waits for key input from the user.

Here, the operation of the OR means 5a will be explained.

1, if the applied voltage does not decrease, inverter gate 2
Since the H4gh signal is input to line 1, the output of 2NAND game) 20 will be in the opposite state to the signal on line 16,
Also, since the output of the 2NAND gate 26 is High, the output of the 2NAND gate 27 is the same as the signal on the line 16, that is, it is a Low signal when the switch means is not operated, and a High signal when it is operated. becomes.

On the other hand, when a drop in the power supply voltage is detected, the signal on line 13 goes low and the output of the 2NAND gate 20 goes high regardless of the signal on line 13. The Q output of the flip-flop 23 is set to High when the reset signal on the line 15 is High or the output of the 2 N A N D gate 20 is Low,
Since PU1 is held until the flip-flop 23 is rewritten by outputting the CK large input signal of the flip-flop 23, when the power supply voltage drops, the flip-flop 2
Since the Q output of 3 is High, 2NAND gate 2
The output of the 2NAND gate 27 becomes Low, and the output of the 2NAND gate 27 becomes High, that is, a High signal is output to the line 19.

Therefore, while the CPU is performing some process, line 19
If the above signal is determined to be High, it is determined that the switch means 15 has been operated or the power supply voltage has decreased, and the process being executed is interrupted and control is transferred to an interruption processing routine.

The flowchart shown in FIG. 3 is an interruption processing routine, and in order to determine whether the switch means 15 has been operated or a voltage drop has occurred, the CPUI outputs a signal 24 to the gate 25 and inverts the detection signal on the line 13. Judging the signal (
Step 100). If the result is High, that is, the signal on line 13 is Low, control shifts to the voltage drop detection processing routine, and a voltage drop message (warning message) is displayed on the display device lO for a certain period of time (step 10).
1) Wait for a certain period of time (step 102), and then set the Q output of the flip-flop 23 to Low (step 103). As a result, the CPUI.

Step 104), the entire system is turned off. Immediately after this off command, the signals on lines 13 and 16 go high.
In order to deal with the case where
After execution, the program moves to the on-routine. In step 103, when the Q output is set to Low, the 2NA
The output h of the ND gate 26 becomes High, and since the output of the 2 NAND gate 20 is also High when the voltage drops, the output of the 2 NAND gate 27 becomes Low.

On the other hand, if it is determined that the signal on the line 14 is HLEh, the power supply voltage is above a certain value, so an interruption message is displayed on the display device 10.
5) After this, the routine moves to a key input waiting routine. Note that even in the key manual standby state, the CPU 1 not only scans the keys on the keyboard 7 but also monitors the signal on the line 19, and when this signal becomes High, jumps to the interruption processing routine.

By the way, when the CPUI is turned off, the signal on the line 19 goes high and it starts operating again. Therefore, if it is off when the power supply voltage is above a certain value, (
At this time, the signal on the line 19 is Low), and the switch means 15
When operated, the signal on line 19 becomes High and C
PU1 turns on and starts operating. However, when the voltage drops, even if the switch means 15 is operated, the signal on the line 19 remains Low, so the CPU is turned off again.
To turn it on, either replace the battery with a new one, or
Alternatively, the reset switch 16 is operated to input a reset signal. After replacing the dry battery and the voltage reaching a certain value or more, when the switch means 15 is operated again, 2NAND
The output of gate 20 becomes Low, and a Hi signal appears on line 19.
At the same time that the gh signal is output and the CPU starts operating, the Q output of the flip-flop 23 also becomes High.

In this embodiment, by ORing the detection signal of the power supply voltage drop to the switch means 15, the software only needs to be designed paying attention to the state of the switch means 15 which instructs interruption during execution. When it is determined that the operation has been performed, it is only necessary to determine whether there is a new interruption instruction or a voltage drop in the interruption processing routine.

(G) Effects of the Invention According to the computer device of the present invention, the software does not need to constantly monitor both processing interruption instructions and voltage drops, and the burden on the software can be reduced. Another advantage is that no new additional software is required when porting a program that has already been created for the current model.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is an electric circuit diagram of the OR means, and FIG. 3 is a flowchart showing the operation. DESCRIPTION OF SYMBOLS 1... CPU (judgment means), 5a... Logical sum means, 11... Power supply voltage detection means, 15... Switch means, 30...
...Notification means. Figure 2 Figure 3

Claims (1)

[Claims] 1. A switch means that outputs a signal to interrupt the process currently being executed when operated, a power supply voltage detection means that detects a drop in power supply voltage, and a signal output by the switch means and a power supply voltage detection means. an OR means for calculating a logical sum with the output signal; a determination means for determining at predetermined intervals whether the switch means has been operated or the power supply voltage has decreased based on the signal output from the OR means; 1. A computer device comprising a notification means for notifying an interruption of processing or a drop in power supply voltage by an output signal.