Rom Correction Application; Storing Example To Eeprom (When One Place Is Corrected); Connecting Example With Eeprom (Using 2-Wire Serial I/O Mode) - NEC PD78056F User Manual

Pd78058f series; pd78058fy series 8-bit single-chip microcontrollers

Table of Contents

ROM Correction Application

(1) Store the correction address and instruction after correction (patch program) to nonvolatile memory (such as

) outside the microcontroller.

When two places should be corrected, store the branch destination judgment program as well. The branch

destination judgment program checks which one of the addresses set to correction address register 0, 1

(CORAD0 or CORAD1) generates the correction branch.

Figure 25-4. Storing Example to EEPROM (When One Place Is Corrected)

Figure 25-5. Connecting Example with EEPROM (Using 2-Wire Serial I/O Mode)

PD78058F, 78058FY

CHAPTER 25 ROM CORRECTION

Source program

CSEG AT 1000H