M37207M8-059SP datasheet(74/121 Pages) MITSUBISHI

74 / 121 page

MITSUBISHI MICROCOMPUTERS

M37207MF-XXXSP/FP, M37207M8-XXXSP

M37207EFSP/FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER

and ON-SCREEN DISPLAY CONTROLLER

ROM CORRECTION FUNCTION

This can correct program data in ROM. Up to 2 addresses (2 blocks)

can be corrected, a program for correction is stored in the ROM cor-

rection memory in RAM. The ROM memory for correction is 32 bytes

!2 blocks.

Block 1 : addresses 02C016 to 02DF16

Block 2 : addresses 02E016 to 02FF16

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 ROM correction address, the main pro-

gram branches to the correction program stored in the ROM memory

for correction. To return from the correction program to the main pro-

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

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

blocks 1 and 2 are used in series, the above instruction is not needed

at the end of the block 1.

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 the blocks

1 and 2.

Fig. 72. ROM Correction Address Registers

Fig. 73. ROM Correction Enable Register

021716

ROM correction address 1 (high-order)

021816

ROM correction address 1 (low-order)

021916

ROM correction address 2 (high-order)

021A16

ROM correction address 2 (low-order)

b7 b6 b5 b4 b3 b2 b1 b0

ROM correction enable register (RCR) [Address 021B16]

After reset RW

ROM Correction Enable Register

Block 1 enable bit (RC0)

Name

Functions

0: Disabled

1: Enabled

Block 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—

2, 3 Fix these bits to“0.”

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