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Figure 21.5-3 Flowchart of Program Patch Processing
Reset
2
Read the 00
of E
PROM
H
YES
2
0000
(E
PROM) = 0
H
NO
Read the address
2
0001
to 0003
(E
PROM)
H
H
MOV
PADR0 (MCU)
Read the patch program
2
0010
to 0090
(E
H
H
MOV
000400
to 000480
H
H
Enable compare
MOV PACSR, #02H
Normal program execution
PC = PADR0
YES
FFFF
INT9
0090
0010
0003
0002
0001
0000
Clear interrupt program
PROM)
Patch program execution
000400
(MCU)
End of patch program
NO
2
E
PROM
H
H
Patch program
H
Lower program address: 00
H
Middle program address: 00
H
Upper program address: 00
H
Size of patch
program in byte: 80
H
CHAPTER 21 ROM CORRECTION FUNCTION
INT9
To patch program
JMP 000400H
to 000480
H
H
JMP FF0050H
FFFFFF
FF0050
ROM
FF0000
FE0000
001100
000480
RAM
000400
000100
000000
MB90462/467
H
H
Abnormal program
H
H
H
Stack area
RAM area
H
Patch program
H
RAM / Register area
H
I/O area
H
581
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