7220 datasheet(188/303 Pages) RENESAS

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APPLICATION

5.3 Usage example of ROM correction function (M37221M8/MA-XXXSP)

7220 Group User’s Manual

5-15

5.3.2 Correction example

The following is an example when 2 addresses (2 blocks) of ROM are corrected.

(1)

Correction example 1

5.3 Usage example of ROM correction function (M37221M8/MA-XXXSP)

Application example using the ROM correction function is described below. In this example, it is assumed

that the program must be changed by specifications modification after completion of ROM mask. Also,

E2PROM is connected to this system.

5.3.1 Connection example

Fig. 5.3.1 Connection example

Fig. 5.3.2 Correction example (1)

I2C-BUS

LDA

DEC

STA

DEC

02C0

02C2

02C3

02C6

02C7

02CA

A980

8D1201

8D1301

4C26E1

Address

(block 1)

LDA

INC

STA

RTS

A900

8D1101

E120

E122

E123

E126

Address

Machine

instructions

Description style

Program before correction

Machine

instructions

Description style

Correction program

Note: In , E126H is specified as the return destination address of JMP.

RTS,

RTS is used instead of JMP, the operation is the same as that of JMP.

As a result, the number of bytes is reduced.

JMP

(See note)

In this example, since the instruction at the return destination address is

even if

#00H

0111H

#80H

0112H

0113H

E126H

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