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CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
7.52
ASR2 (Arithmetic Shift to the Right Direction)
Make an arithmetic right shift of the word data in "Ri" by "{u4 + 16}" bits, store the
result to "Ri".
■ ASR2 (Arithmetic Shift to the Right Direction)
Assembler format:
ASR2 #u4, Ri
Operation:
Ri > > {u4 + 16} → Ri
Flag change:
N: Set when the MSB of the operation result is "1", cleared when the MSB is "0".
Z: Set when the operation result is "0", cleared otherwise.
V: Unchanged
C: Holds the bit value shifted last.
Execution cycles:
1 cycle
Instruction format:
Example:
ASR2 #8, R3
146
N
Z
V
C
C
C
–
C
MSB
1
0
1
1
Instruction bit pattern :
1011 1001 1000 0011
R3
F 0 F F F F F F
N Z V C
CCR
0 0 0 0
Before execution
1
0
0
1
u4
LSB
Ri
R3
F F F F F F F 0
N Z V C
CCR
1 0 0 1
After execution
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