JPS63230370A - printer device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] A printer device that operates by writing various setting values in a rewritable non-volatile memory is provided with a means for checking whether there is any erroneous writing in the memory and a reset circuit. established,
These prevent incorrect settings.

[Industrial application field]

The present invention relates to a printer device that operates by writing various setting values in a rewritable non-volatile memory.

[Conventional technology]

As shown in FIG. 5, under the wings of the main control section 1 are an interface section 2, a reception buffer 3, a setting circuit 4, a non-volatile storage device (non-volatile memory) 5, a line feed control section 6, a space control section 7, and a print control section. In a conventional printer device equipped with a section 8, a line buffer 9, etc., when various values for printing such as font, length, character pinch, and interface information are set in the setting circuit 4, the set values are non-volatile by the main control section 1. It is used after being stored in the digital memory 5. This is so that even if the power to the device is once turned off, the same set value can be used when the power is turned on again.

The various set numerical values mentioned above are sometimes standard values, but in most cases, the operator inputs numerical values that match the purpose of use through the setting circuit 4, so that printing is performed in the conditions desired by the operator.

As the non-volatile memory, EEFROM, Panteri support RAM, etc. are used.

[Problem that the invention seeks to solve]

In the printer device described above, the data in the nonvolatile memory 5 may change to a value different from the numerical value set by the setting circuit 4. Such an error (erroneous write) occurs when ■ when removing/inserting/installing/removing non-volatile memory.
This occurs when there are fluctuations in the power supply voltage or noise due to static electricity. Conventionally, printers have been used without checking for this type of data error, which has led to unexpected malfunctions of the printer device.

The present invention attempts to detect the above-mentioned erroneous writing and correct the data in the memory 5 to a value that will not cause the erroneous operation.

[Means for solving the problem] Fig. 1 is a diagram showing the principle of the present invention, in which 10 is an erroneous writing confirmation circuit;
1 is a reset circuit. The erroneous write confirmation circuit performs an error check using data that detects whether the contents (set numerical values) of the nonvolatile storage device 5 are normal or abnormal. The data is as follows:
For example, the set numerical values are added in byte units and the respective sums are used (these sums are written in a non-volatile memory).

The reset circuit 11 is a ROM that stores standard setting values.
The ROM is read out using the ROM and the read data is written into the nonvolatile memory to perform reset.

[Effect]

The erroneous write confirmation circuit 10 checks the data written in the nonvolatile memory 5, and activates the reset circuit 11 when an error is detected. In this example, the error check is performed by adding the set numerical values currently stored in the non-volatile memory in byte units, storing the sum as described above (and comparing it with the sum to find a match/mismatch). Resetting circuit 11
When an error is detected, the data in the ROM is written into the non-volatile memory 5, and the contents of the memory 5 are rewritten into standard numerical values. As a result, although it is not an operator-set value,
The printer operates according to the standard setting values, and abnormal operations can be prevented. This resetting process is preferably performed as part of the initial process when the power is turned on.

The erroneous writing confirmation circuit 0 and the reset circuit 11 can also be used to check when the operator has made settings. In this case, since the set value is known, you can read the nonvolatile memory and compare its contents with the set value bit by bit, or you can compare the sum of each byte as described above. )
If there is a mismatch, the reset circuit 11 is activated to write the set value into the non-volatile memory, so that the contents of the non-volatile memory are correctly set according to the number set by the operator.

〔Example〕

FIGS. 2 to 4 are explanatory diagrams showing one embodiment of the present invention. The non-volatile memory 5 is a volatile RA as shown in FIG.
It consists of an M section 51 and a non-volatile ROM section 52, and the numerical value set by the setting circuit 4 is once written to the RAM section 51.
From there, the data is further written to the ROM section (EEFROM or RAM of pantry support) 52 and saved. The data to be saved also includes the erroneous writing confirmation value (the sum of the above-mentioned bytes) A.

FIG. 3(a) shows the incorrect writing confirmation calculation process, (bl is R
The process of moving from the AM section to the ROM section is shown.

The role of the main control unit 1 is to write the setting value set by the setting circuit 4 into the non-volatile memory I75, but after this writing, the erroneous writing confirmation circuit 10 writes the setting value set in the RAM unit 51 from the setting value remaining in the RAM unit 51. The obtained erroneous writing confirmation value A is compared with the erroneous writing confirmation value (referred to as A') read from the ROM section 52. At this time A′? If A, the resetting circuit 10 is the RAM section 51
The remaining setting values are rewritten into the ROM section 52.

This operation is repeated until each byte becomes A'-A.

By doing so, the numerical value set from the setting circuit 4 during the commuting operation is correctly stored in the nonvolatile memory 5.

When the power is turned on again, the contents of the RAM section 51 have been erased, so the main control section 1 transfers the contents of the ROM section 52 to the RAM section 51. FIG. 3 fcl shows the processing in this case. At this time, the erroneous writing confirmation circuit 10 calculates an erroneous writing confirmation value (A) from the set value transferred from the ROM section 52 to the RAM section 51, and combines this with the erroneous writing confirmation value stored in the ROM section 52. (A'
). There is no problem if A′ −A, but A′k
If it becomes A, it means data destruction. However, in this case, since there is nothing in the setting circuit 4, the main control section 1 uses the initial value storage circuit (R
The initial value (standard setting numerical value) is taken out from the OM) 12 and written into the non-volatile memory 5. At this time, erroneous writing can be detected in the same manner as described above.

〔Effect of the invention〕

As described above, according to the present invention, even if the data in the nonvolatile memory 5 becomes an error due to fluctuations in power supply voltage, noise due to static electricity, etc., this can be detected and reset to the standard setting value. , it is possible to prevent malfunctions of the printer device.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the principle of the present invention, Fig. 2 is a configuration diagram of a non-volatile memory, Fig. 3 is a flow chart showing the operation of the present invention, Fig. 4 is a block diagram of the printer device of the present invention, and Fig. 5 is a block diagram of the printer device of the present invention. FIG. 1 is a block diagram of a conventional printer device.

Claims (1)

[Claims] A circuit (4) for setting various numerical values regarding printing operations, a rewritable non-volatile memory device (5) for storing the numerical values set by the setting circuit, and detecting errors in data in the non-volatile memory device. an erroneous writing confirmation circuit (10); a resetting circuit (11) for rewriting the set value to the nonvolatile storage device (5) when the erroneous writing confirmation circuit detects an error;
A printer device comprising: an initial value storage circuit (12) for storing set numerical values to be written into a nonvolatile storage device by the reset circuit.