TMP88CS38BFG datasheet(41/218 Pages) TOSHIBA

41 / 218 page

TMP88CS38B/CM38B/CP38B

2007-09-12

88CS38B-41

Example 2: Replacing data 55H at 0C020H with 33H

Using the initial routine program, which is executed right after reset, read the

start address of the data to be replaced and the patch data from the external

memory. Set CMx (x: 0 to 3) to “1” to change the correction mode to the data

replacement mode. Specify the start address (0C020H) of the data to be replaced

as the corrective ROM address. Then, specify the new three-byte data (33H for

0C020H, CCH for 0C021H, and C3H for 0C022H) as the patch data.

Note 1: Corrective address must be assigned to constant data area on the data

replacement mode. (Ope-code and ope-rand can’t be replaced by ROM correction

circuit.)

Note 2: Instructions which includes “(HL

+)” or “(−HL) ” operation can't be replaced by ROM

corrective circuit on the data replacement mode.

DBR

SFR

RAM

00000H

0003FH

00040H

0083FH

00F80H

00FFFH

04000H

FFFFFH

ROM

0C021H

55H

AAH

A5H

0C020H

0C022H

CCH

33H

3CH

Replacement data

1. At HL

= 0C020H, Executing LD A, (HL) loads 33H in A. (Data replacement)

2. At HL

= 0C021H, Executing LD A, (HL) loads AAH in A. (No data replacement)

3. At HL

= 0C020H, Executing LD WA, (HL) loads CC33H in WA. (Data replacement)

4. At HL

= 0C020H, Executing LD IX, (HL) loads CCC33H in IX. (Data replacement)

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