M37151 datasheet(49/139 Pages) RENESAS

49 / 139 page

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER

and ON-SCREEN DISPLAY CONTROLLER

M37151M6/M8/MA/MC/MF-XXXFP, M37151EFFP

MITSUBISHI MICROCOMPUTERS

Rev. 1.0

Fig. 8.9.1 ROM Correction Address Registers

8.9 ROM CORRECTION FUNCTION

This can correct program data in the ROM. Up to 2 addresses can be

corrected; a program for correction is stored in the ROM correction

vector in the RAM as the top address. There are 2 vectors for ROM

correction:.

Vector 1 : address 030016

Vector 2 : address 032016

Set the address of the ROM data to be corrected into the ROM cor-

rection address register. When the value of the counter matches the

ROM data address in the top address of the ROM correction vector,

the main program branches to the correction program stored in the

ROM memory. To return from the correction program to the main

program, the op code and operand of the JMP instruction (total of 3

bytes) are necessary at the end of the correction program.

The ROM correction function is controlled by the ROM correction

enable register.

Notes 1: Specify the first address (op code address) of each

instruction as the ROM correction address.

2: Use the JMP instruction (total of 3 bytes) to return from

the correction program to the main program.

3: Do not set the same ROM correction address to both vectors 1

and 2.

020A16

ROM correction address 1 (high-order)

020B16

ROM correction address 1 (low-order)

020C16

ROM correction address 2 (high-order)

020D16

ROM correction address 2 (low-order)

b7 b6 b5 b4 b3 b2 b1 b0

ROM correction enable register (RCR) [Address 020E 16]

After reset

ROM Correction Enable Register

Vector 1 enable bit (RC0)

Name

Functions

0: Disabled

1: Enabled

Vector 2 enable bit (RC1)

0: Disabled

1: Enabled

Nothing is assigned. These bits are write disable bits. When

these bits are read out, the values are “0.”

R —

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