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CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
7.51 ASR (Arithmetic Shift to the Right Direction)
Makes an arithmetic right shift of the word data in "Ri" by "u4" bits, stores the result to
"Ri".
■ ASR (Arithmetic Shift to the Right Direction)
Assembler format: ASR #u4, Ri
Operation: Ri >> u4 → 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. Cleared when the shift amount is "0".
Execution cycles: 1 cycle
Instruction format:
Example: ASR #8, R3
NZVC
CC–C
MSB LSB
10111000 u4 Ri
R3 R3
FFFF 0FFFFF0F FFFF
NZVC
CCR CCR
NZVC
10010000
Instruction bit pattern : 1011 1000 1000 0011
Before execution After execution