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Figure 26-10. Program Transition Diagram (when Two Places are Corrected)
FFFFH
F7FFH
F7FDH
yyyyH
xxxxH
Destination judge program
JUMP
0000H
(1) Branches to address F7FDH when fetch address matches correction address
(2) Branches to branch destination judgment program
(3) Branches to correction program 1 by branch destination judgment program (BTCLR !CORST0, $xxxxH)
(4) Returns to internal ROM program
(5) Branches to address F7FDH when fetch address matches correction address
(6) Branches to branch destination judgment program
(7) Branches to correction program 2 by branch destination judgment program (BTCLR !CORST1, $yyyyH)
(8) Returns to internal ROM program
Remark Area filled with diagonal lines : Internal expansion RAM
JUMP : Correction program start address
CHAPTER 26 ROM CORRECTION
BR !JUMP
Correction program 2
Correction program 1
Internal ROM
Correction place 2
Internal ROM
Correction place 1
Internal ROM
(6)
(2)
(3)
(4)
(5)
(1)
(7)
(8)
567
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