User’s Manual U16899EJ2V0UD
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CHAPTER 25 ROM CORRECTION
25.1 Functions of ROM Correction
The
µ
PD78F0136H, 78F0138H, and 78F0138HD can replace part of a program in the flash memory with a
program in the internal expansion RAM.
Program bugs found in the flash memory can be avoided, and program flow can be changed by using the ROM
correction.
The ROM correction can correct two places (max.) of the internal flash memory (program).
Caution The ROM correction cannot be emulated by the in-circuit emulator.
25.2 Configuration of ROM Correction
The ROM correction includes the following hardware.
Table 25-1. Configuration of ROM Correction
Item Configuration
Registers Correction
address registers 0 and 1 (CORAD0, CORAD1)
Control register
Correction control register (CORCN)
Figure 25-1 shows a block diagram of the ROM correction.
Figure 25-1. Block Diagram of ROM Correction
Match
CORENn CORSTn
Program counter (PC)
Comparator
Correction address
register n (CORADn)
Internal bus
Correction control register
Correction branch request
signal (BR !F7FDH)
Branch instruction
generator
Remark n = 0, 1
Содержание MuPD78F0132H
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