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CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
7.1
ADD (Add Word Data of Source Register to Destination
Register)
Add word data in "Rj" to word data in "Ri", store results to "Ri".
■ ADD (Add Word Data of Source Register to Destination Register)
Assembler format:
ADD Rj, Ri
Operation:
Ri + Rj → Ri
Flag change:
N :
Z :
V :
C :
Execution cycles:
1 cycle
Instruction format:
Example:
ADD R2, R3
72
N
Z
V
C
C
C
C
C
Set when the MSB of the operation result is "1", cleared when the MSB is "0".
Set when the operation result is "0", cleared otherwise.
Set when an overflow has occurred as a result of the operation, cleared otherwise.
Set when a carry has occurred as a result of the operation, cleared otherwise.
MSB
1
0
1
0
R2
1 2 3 4 5 6 7 8
R3
8 7 6 5 4 3 2 1
N Z V C
CCR
0 0 0 0
Before execution
0
1
1
0
Rj
LSB
Ri
R2
1 2 3 4 5 6 7 8
R3
9 9 9 9 9 9 9 9
N Z V C
CCR
1 0 0 0
After execution
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