Rom Correction Application; Storing Example To Eeprom (When One Place Is Corrected); Connecting Example With Eeprom (Using 2-Wire Serial I/O Mode) - NEC PD78076 User Manual

Pd78078 series; pd78078y series 8-bit single-chip microcontrollers

Table of Contents

26.4 ROM Correction Application

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

) 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 CORAD0 or CORAD1 generates

the correction branch.

Figure 26-4. Storing Example to EEPROM (when One Place is Corrected)

Figure 26-5. Connecting Example with EEPROM (Using 2-Wire Serial I/O Mode)

PD78078, 78078Y Subseries

CHAPTER 26 ROM CORRECTION

Source program

CSEG AT 1000H