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17.1 Overview
The ROM correction function is used to replace part of the program in the mask ROM with the program of an
external RAM or the internal RAM.
By using this function, instruction bugs found in the mask ROM can be corrected at up to four places.
Correction control
register (CORENn bit)
Remark
n = 0 to 3
CHAPTER 17 ROM CORRECTION FUNCTION
Figure 17-1. Block Diagram of ROM Correction
Instruction address bus
Correction
address register n
(CORADn)
DBTRAP instruction
Comparator
Preliminary User's Manual U15905EJ1V0UD
ROM
generation block
Block replaced
by DBTRAP
instruction
Instruction data bus
471
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