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CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
Example: INT #20H
6809 6800 6809 6800
8088 8088
FFFF F8F0
R15
000FFF7C
xxxx xxxx
7FFFFFF8
7FFFFFFC
80000000
000FFF7C
7FFFFFF8
7FFFFFFC
80000000
8000 0000
4000 0000
SSP
TBR
4000 0000
000F FC00
USP
PC
FFFF F8F0
8088 8086
PS
110000
SINZVC
CCR
R15
7FFF FFF8
7FFF FFF8
SSP
TBR
4000 0000
000F FC00
USP
PC
FFFF F8C0
6809 6800
PS
000000
SINZVC
CCR
Memory Memory
Before execution After execution
xxxx xxxx
xxxx xxxx
xxxx xxxx
Instruction bit pattern : 0001 1111 0010 0000