JPS6165562A - Memory checking system - Google Patents

Abstract

PURPOSE:To make re-registration unnecessary after the test and efficiently by reading and preserving part of the memory contents of a memory, re-writing the inverted contents of the memory contents to the original address position of the memory, reading the contents of the address position again, comparing with the inverted contents, when coincident, returning the memory contents first preserved to the original address and when dissident, making the memory abnormal. CONSTITUTION:An address of a memory 20 is read by a micro-processor 19 in the younger order a register 19a. The memory contents stored in a register 19 are inverted and stored by an inverting circuit 19b. Next, the contents stored in a register 19c are written in the original storing position of a memory 20 and read in a register 19d again. The contents stored in the register 19c and the contens stored in the register 19d are compared by a comparator 19e, and when coincident, the stored contents of the register 19a are returned to the said address position, said address position of the memory 20 is +1, until all areas are completed, a memory address is renewed and the same action is repeated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a memory check method for a telephone equipped with an auto-dial function, for example.

An auto-dial telephone is a telephone that is activated by pressing a call button and automatically sends out a pre-stored subscriber telephone number of the destination of the call as a dial pulse.

For this purpose, an internal memory is added to the telephone to implement the above functions, and the subscriber's telephone number to be registered can be stored and the desired subscriber's telephone number can be read out at any time with simple operation. .

FIG. 3 is a diagram showing the appearance of an auto-dial telephone as an example.

FIG. 4 is a diagram showing an example of the equipment configuration of an auto-dial telephone.

In the figure, 1 is the receiver, 2 is the speaker, 3 is the display, 4 to 1
1 is a one-touch button, 12 is a dial button, 13 is a registration button and its display lamp, 14 is a button for driving the speaker 2 and its display lamp, 15 is a function button and its display lamp, 16 is an incoming call unit, 17 18 is a dialing circuit, 19 is a microprocessor,
20 is a memory, 21 is a keyboard section, and 22 is a display section. The same symbols represent the same objects throughout all the figures below.

The auto-dial telephone has a built-in microprocessor 19, and the user can use the one-touch buttons 4 to 11, the dial button 12, the registration button 13, the button 14 for driving the speaker 2, the function button 15, etc. mounted on the keyboard section 21. When operated, the microprocessor 19 operates to store the subscriber's telephone number in the memory 20 and perform an auto-dial function.

[Conventional technology]

This memory 20 is usually random access memory RAM.
Although a memory check of the memory 20 has rarely been performed in the past, when it was forced to do so, it was performed using the following procedure.

First, operate the keyboard section 21 to reset all data at all addresses in the memory 20, write the data of OL and 1 to each address, visually check the written result on the display 3, and check if it is good. For example, the same operation is repeated for the next address, and after checking all addresses in this way, the subscriber number is registered in the memory 20 again. Therefore, there is a drawback that it is very time consuming.

[Problem that the invention seeks to solve]

The present invention eliminates the drawbacks of the above-mentioned conventional methods and provides a memory check method that is more efficient and does not require re-registration after testing.

[Means for solving problems]

A means for solving the problem is to read out and save a part of the memory contents of a telephone set having a memory for storing subscriber telephone numbers, and to invert the read memory contents. rewrite the stored content to the original address location of the memory, read out the content of the address location again and compare it with the inverted content, and if they match, return the initially saved memory content to the original address location. , if there is a mismatch, this is achieved by treating the memory as an abnormality.

[Effect]

According to the present invention, a memory test is performed using the subscriber telephone number information device automatically stored in the memory by the built-in microprocessor of the telephone, and the registered subscriber telephone number information cannot be destroyed. Since there is no memory, the memory can be checked extremely efficiently.

〔Example〕

FIG. 1 is a control flowchart of an embodiment of the memory check method according to the present invention.

FIG. 2 is an explanatory diagram of the configuration of an embodiment of the memory check method according to the present invention.

In the figure, 19a, 19c, 19d are registers, 19b
19e is an inverting circuit, and 19e is a comparison circuit.

According to the invention, the function button 15 and its indicator lamp are used for memory testing. That is, when the function button 15 is pressed, its indicator lamp lights up to indicate that a test is in progress, the microprocessor 19 operates, and the test is carried out according to the flowchart shown in FIG.

When the test starts by first turning on the test switch,
The microprocessor 19 reads out the memory 20 in ascending order of addresses and stores them in the register 19a built into the microprocessor 19. (In the example in Figure 2, it is set to 5 “
0101" is stored in the register 19a).The memory content stored in the register 19a is stored in the inverting circuit 1.
9b, becomes "1010" in the example, and is stored in the register 19c.

Next, the contents stored in the register 19c are written to the original storage location in the memory 20, and then again in the register 19d.
■ to be read out. Register 19c by comparator 19e
The contents stored in the register 19d are compared with the contents stored in the register 19d, and if they match (indicating that the corresponding address location in the memory 20 is operating normally), the contents stored in the register 19d are compared.
The stored content of 9a, for example "0101", is returned to the corresponding address position in the memory 20 and 0, then the corresponding address position in the memory 20 is +1 until the end of the entire area ■, the memory address is updated, and the same operation is performed. repeat. When all is completed, the test lamp is turned on to indicate normal completion.

If the comparison results do not match, the contents stored in the register 19a, for example "0101", are returned to the corresponding address location in the memory 20, and the display lamp blinks to indicate that the corresponding address location in the memory 20 is defective. ■.

In this way, the test can be sequentially executed on all addresses in the memory 20, and when the function button 15 is pressed again, the display lamp will go out.■.

If the memory is abnormal, work such as replacing the memory with a normal one is performed.

〔Effect of the invention〕

As described above in detail, the present invention has the great effect of being able to check the memory extremely efficiently and without destroying the contents stored in the memory.

[Brief explanation of the drawing]

FIG. 1 is a control flowchart of an embodiment of the memory check method according to the present invention. FIG. 2 is an explanatory diagram of the configuration of an embodiment of the memory check method according to the present invention. FIG. 3 is a diagram showing the appearance of an auto-dial telephone as an example. FIG. 4 is a diagram showing an example of the equipment configuration of an auto-dial telephone. In the figure, 1 is the receiver, 2 is the speaker, 3 is the display, 4 to 1
1 is a one-touch button, 12 is a dial button, 13 is a registration button and its display lamp, 14 is a button for driving the speaker 2 and its display lamp, 15 is a function button and its display lamp, 16 is an incoming call unit, 17 is a dialing circuit section, 18 is a calling circuit section, 19 is a microprocessor,
20 is a memory, 21 is a keyboard section, 22 is a display section, 1
9a, 19G, and 19d are registers, 19b is an inversion circuit, and 19e is a comparison circuit.

Claims (1)

[Claims] In a telephone set having a memory for storing a subscriber's telephone number, a part of the stored contents of the memory is read out and saved, and the reversed contents of the read stored contents are stored at the original address location of the memory. , read the contents of the address position again and compare it with the inverted contents,
A memory check method characterized in that if a match is found, the initially stored storage content is returned to the original address position, and if a match is found, the memory is determined to be abnormal.