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25.1 Functions of ROM Correction
µ
The
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.
Registers
Control register
Figure 25-1 shows a block diagram of the ROM correction.
Program counter (PC)
Comparator
Correction address
register n (CORADn)
Remark n = 0, 1
CHAPTER 25 ROM CORRECTION
Table 25-1. Configuration of ROM Correction
Item
Correction address registers 0 and 1 (CORAD0, CORAD1)
Correction control register (CORCN)
Figure 25-1. Block Diagram of ROM Correction
Match
CORENn CORSTn
Correction control register
Internal bus
User's Manual U16899EJ2V0UD
Configuration
Branch instruction
generator
Correction branch request
signal (BR !F7FDH)
419
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