JPS6349861A - Method for processing battery fault - Google Patents

Abstract

PURPOSE:To enable information of battery fault by writing previously the fixed data recorded to a ROM to a memory and comparing this fixed data with that read out of the ROM in an application mode of a power supply, and clearing a timepiece data, if the result is inconsistency. CONSTITUTION:When a power supply 7 is switched off, a switch 8 is connected to a battery 9 and the power of the battery 9 is supplied to a memory 3 as well as a timepiece 4. When the power supply 7 is applied, the switch 8 is connected to the power supply 7 and a current is supplied to the memory 3 and the timepiece 4. A processor 1 works after reading a program out of a ROM 2 and compares the fixed data written to the memory 3 with that read out of the ROM 2. When no coincidence is obtained between both data, the processor 1 clears the timepiece 4 and displays an indication at a display part 5 to set a time point, etc. (A battery fault can also be displayed.)

Description

[Detailed Description of the Invention] [Summary] In an information processing device that backs up volatile memory and a clock using a battery and saves data stored in the memory even when the power is turned off, fixed data recorded in a ROM is written to the memory. When the power is turned on and compared, it is determined that there is a battery failure, and the clock data is cleared to notify the operator of the battery failure.

[Industrial application field]

The present invention relates to an information processing device that backs up a volatile memory or a clock using a battery, and in particular, processing for a battery failure when data stored in the memory is destroyed due to a battery failure that occurs during backup using a battery. Regarding the method.

2. Description of the Related Art In an information processing device, it is known that a battery is used to power up the volatile memory in order to save the contents of the volatile memory and hold date and time data when the information processing device is powered off. By the way, this battery may become exhausted and the voltage may drop, causing the contents of the memory to be destroyed.

Therefore, it is necessary to check whether the contents of the memory have been destroyed or not. For example, if fixed data written in the ROM is written to the memory, and every time the information processing device is turned on, the data will be deleted from the ROM. A battery failure can be detected by comparing the read fixed data with the fixed data written in the memory.

In this way, when a battery failure is detected, it is necessary to notify the processor of the information processing device of the failure so that subsequent processing can be executed smoothly.

[Conventional technology]

Conventionally, information processing devices that use batteries to back up memory and clocks record fixed data in memory and compare fixed data every time the power is turned on to detect battery failures. Even if the contents are destroyed, the processor of the information processing device is not notified.

[Problem that the invention seeks to solve]

As mentioned above, even if the contents of the battery-backed memory or the date and time data on the clock are destroyed, the processor of the information processing equipment is not notified, so if the operator misses it when turning on the power, the data may be processed incorrectly. There is a problem that the wrong date and time are recorded.

[Means for solving problems]

FIG. 1 is a block diagram of a circuit showing one embodiment of the present invention.

1 is a processor that controls the entire device, 2 is a processor l
3 is a continuous memory, 4 is a clock, 5 is a display section,
6 is a keyboard through which an operator inputs commands, etc.; 7 is a power source; 8 is a switch; and 9 is a battery.

When the power supply 7 is turned on, the processor 1 stores the ROM 2
Fixed data is read from the memory 3, compared with the fixed data written in the memory 3, and if there is no failure, the memory 3 and the clock 4 are cleared.

[Effect]

With the above configuration, the processor 1 determines whether the battery 9 has failed each time the power is turned on, depending on whether the fixed data in the memory 3 is destroyed, and if the fixed data in the memory 3 is destroyed, In order to clear the memory 3 and clock 4, when the processor 1 starts up, the date and time data of the clock 4 is checked. Since the date and time data is zero, the battery failure is detected by displaying clock setting instructions, etc. The operator can be notified.

〔Example〕

FIG. 2 is a flowchart explaining the operation of FIG. 1.

In FIG. 1, when the power source 7 is turned off, the switch 8 is connected to the battery 9 side as shown by the dotted line, and the current from the battery 9 is supplied to the memory 3 and the clock 4.

When the power source 7 is turned on, the switch 8 is connected as shown by the solid line, and current is supplied from the power source 7 to the memory 3 and the clock 4. Of course, the switch 8 is a non-stop switch.

The processor 1 operates by reading a program from the ROM 2, and compares the fixed data written in the memory 3 with the fixed data read from the ROM 2, as shown in FIG. Here, if the comparison results match, it is checked whether the clock 4 has been cleared or not, and if it has not been cleared, the routine shifts to normal processing and operates according to the operator's instructions entered from the keyboard 6.

When the fixed data in memory 3 and the fixed data in ROM2 do not match, processor 1 clears memory 3 and then
Fixed data is read from OM2 and written to memory 3. Then, clock 4 is cleared. Next, it is checked whether the clock 4 has been cleared, and if it has been cleared, an instruction to set the time, for example, is displayed on the display section 5. (Of course, it may be displayed as a battery failure.) Since the clock has been cleared, the operator knows that the memory contents were destroyed while the power was turned off, and sets the time on the clock. Processor 1 shifts to normal processing.

〔Effect of the invention〕

As explained above, the present invention clears the memory and clock when the contents of the battery-backed memory and clock are destroyed due to a battery failure, and can notify the operator of the battery failure. This has the effect of saving the effort of manually clearing the memory.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a circuit showing one embodiment of the present invention, and FIG. 2 is a flowchart explaining the operation of FIG. 1. In the figure, 1 is a processor and 2 is a ROM. 3 is memory, 4 is clock, 5 is display, 6 is keyboard, 7 is power supply,
8 is a switch, and 9 is a battery. 2. 杢发日月Ichihowa・sa・] Moss power and J 謂T 類j Irif'口・SOF fig. ? v-to skin 5
2 figure

Claims (1)

[Claims] Volatile memory (3) and clock (4) using a battery (9)
In an information processing device that performs backup, fixed data is written from a nonvolatile memory (2) to the volatile memory (3), and when the information processing device is powered on, it is read from the nonvolatile memory (2). Compare the fixed data written in the volatile memory (3) with the fixed data written in the volatile memory (3),
If there is a mismatch, the volatile memory (3) and clock (
4) A processing method for a battery failure, characterized by clearing the data.