JPS6277660A - Arithmetic device - Google Patents

Abstract

PURPOSE:To easily replace a user ROM by storing the user ROM previously with discrimination data for discriminating the user ROM. CONSTITUTION:The user ROM 4 is stored with the discrimination data DS for discriminating the user ROM 4 previously and a RAM 33 is provided with a specific address 35 in which the discrimination data DS read out of the user ROM 4 is stored. Further, a microcomputer 3 is provided internally with a comparing means 36 which reads the discrimination data DS stored in the specific address 35 of the RAM 33 and the discrimination data stored in the user ROM 4 and compares both data with each other, a storage means 37 which stores arithmetic and control specification data and user ROM discrimination data from the user ROM 4 in the RAM 33 when the comparing means 36 judges the dissidence between both data, and an arithmetic control means 38 which performs arithmetic and control by using the data stored in the RAM 33 when coincidence is decided by the comparing means 36.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention has a microcomputer and a removable read-only memory (hereinafter abbreviated as ROM) that stores various calculation formulas, calculation parameters, and calculation data. It relates to arithmetic devices.

(Prior Art) FIG. 3 is a configuration block diagram showing an example of a conventional arithmetic device equipped with a removable ROM. Here, an analog signal is input, A/D converted, and a microcomputer performs predetermined operations such as proportional, integral, and differential operations.
A controller that performs E is illustrated. In the figure, the analog signal e1. @2 Multiplexer that selects..., 2
3 is a comparator that receives the signal selected by multiplexer 1 as one input; 3 is a microcomputer that receives the signal from comparator 2; and 3 is a microcomputer that receives the signal from comparator 2. The CPU 31 and various programs are connected to each other by a data bus DB. Random access memory (RAM) 33 backed up by ROM 32 and batch IJBA
have. 4 is a ROM (hereinafter referred to as a user's ROM) which is removably attachable to the data bus DB, and stores data specifying the combination configuration of calculation and control functions and various parameters. 5 is a D/A converter that converts the digital signal output from the microcomputer 3 into an analog signal, and the analog signal e is D/A converted here. held by the sample and hold circuit 7,
The calculation result is output from the output terminal 6. Note that %D
/A converter 5 is applied to the other input terminal of comparator 2, and comparator 2. The microcomputer 3 and the D/A converter 5 constitute a loop, which is for converting input analog signals e, e2, . . . into digital signals.

Backed up by battery BA 7'CRAM3
3 stores combination configuration designation data and various parameters for calculation and control functions.
It is determined whether the volatilization check data that U31 has stored in the specific address of RAM 33 is correct, and if it is incorrect, the contents of the user's ROM 4 are copied to the RAM 33 side.

(Problems to be Solved by the Invention) In the conventional device with such a configuration, the CPU 31 has
The data read out from the RAM 33 is normally used to perform various calculations and controls.

For this reason, if you want to replace the user's ROM 4 and perform other calculations or control, you can change the volatilization check data in the RAM 33 by, for example, shorting out the battery BA.
There was a problem in that it took a long time to replace the p1 user's ioM, as it required removing the B A and causing a long power outage to volatilize it.

The present invention was made in view of these problems, and
To this end, the present invention aims to realize an arithmetic device that can easily perform other arithmetic operations and controls simply by replacing the user's ROM.

(Means for Solving the Problems) The present invention, which solves the above-mentioned problems, includes a microcomputer, a battery-backed random access memory (RAM), and a user read-only memory (a user's read-only memory that is detachable from the data bus). a user's ROM), in which the user's ROM stores in advance identification data for identifying the user's ROM, a specific location is provided in the RAM to store this identification data, and the microcomputer includes a , identification data stored in a specific address of the RAM and the user's ROM
a comparison means for comparing the identification data read from the user's ROM, a means for storing at least the identification data and calculation and control designation data from the user's ROM in a RAM side when the comparison means determines that they do not match; and the comparison means The present invention is characterized by further comprising means for performing calculation and control according to the data stored in the RAM when it is determined that they match.

(Example) FIG. 1 is a block diagram of the configuration of an apparatus according to the present invention.

Components corresponding to those in FIG. 6 are designated by the same reference numerals.

In this device, identification data DS for identifying the user's ROM 4 (data stored in this user's TtOM4) is stored in advance in the user's ROM d, and identification data DS read out from the user's ROM 4 is stored in the RAM 33. Specific location (address) 35 to store
It has been established. Further, within the microcomputer 3, there is a comparison means 36 for reading out the identification data DS stored in the specific address 35 of the RAM 33 and the identification data stored in the user's ROM 4 and comparing both data. When the comparing means 36 determines that they do not match (mismatch), the calculation and control designation data and the user's ROM identification data are transferred from the user's ROM 4.
Storage means 37 stored on the RAM 33 side and comparison means 36
, when it is determined that there is a match, the calculation is performed using the data stored in the RAM 33;
A control means 38 is provided. Note that each of these means 36, 37, and 38 is realized by a program.

The operation of the device configured in this manner will be described next. Second
The figure is a flowchart showing an example of the operation performed by the microcomputer 3.

Prior to a predetermined calculation, the microcomputer 3 first reads out the identification data already stored in the specific address 35 of the RAM 33, and also reads out the identification data DS stored in the user's ROM 4 (step 1).
). Next, each piece of identification data read out in step 1 is compared by comparison means 36 (step 2). In step 2, if it is determined that there is a mismatch, the user's RO
From M4, calculation, control specification data and user's ROM
The identification data is stored in the RAM 33 by the storage means 37 (step 3). If it is determined that they match in step 2, and if step 3 is completed, the process moves to step 4, where the calculation and control means 38
Perform calculations and control using data stored in (
Step 4). Thereafter, return to step 1 or repeat step 4.

Through this operation, when a new user's ROM is replaced and installed, the microcomputer will know that it has been replaced due to the mismatch in its identification data, and the RA will
Store (copy) the data on the M33 side. Furthermore, even in the case of a long power outage, data from the user's ROM side is stored in the same way.

Note that in the above embodiment, A/
Although a device that performs D conversion has been shown, a device that performs A/D conversion using an A/D converter may also be used.

(Effects of the Invention) As explained above, according to the present invention, the user's ROM
In other words, various types of data such as calculations and control data can be easily changed without considering the data stored in the RAM.

[Brief explanation of drawings]

FIG. 1 is a configuration block diagram showing an example of the device of the present invention, and FIG.
The figure is a flowchart showing an example of the operation, and FIG. 3 is a block diagram of the configuration of the conventional device. l...Multiplexer 2...Comparator 3...Microprocessor 4...User's ROM5...D
/A converter 31...CPU 32...ROM 33...
RAM36... Comparison means 37... Storage means 3
8... Calculation and control means Figure 1 Figure Z

Claims (1)

[Scope of Claim] An arithmetic device comprising a microcomputer, a battery-backed random access memory (RAM), and a user's read-only memory (user's ROM) that is removably connected to a data bus, Identification data for identifying the user's ROM is stored in advance, a specific location for storing this identification data is provided in the RAM, and the identification data stored at a specific address in the RAM and the identification data are stored in the microcomputer in advance. a comparison means for comparing identification data read from the user's ROM; and means for storing at least the identification data and calculation and control designation data from the user's ROM in a RAM side when the comparing means determines that they do not match; 1. A calculation device comprising: means for performing calculations and control according to data stored in the RAM when the comparison means determines a match.