NEC PD78078 用户手册

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CHAPTER 26 ROM CORRECTION

26.6 Program Execution Flow

Figures 26-9 and 26-10 show the program transition diagrams when the ROM correction is used.

Figure 26-9. Program Transition Diagram (when One Place is Corrected)

(1) Branches to address F7FDH when fetch address matches correction address

(2) Branches to correction program

(3) Returns to internal ROM program

Remark

Area filled with diagonal lines : Internal expansion RAM

JUMP : Correction program start address

Correction place

Internal ROM

JUMP

FFFFH

F7FFH

F7FDH

xxxxH

0000H

(1)

(2)

(3)

BR !JUMP

Correction program