Fujitsu CM71-00101-5E User Manual
141
CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
7.47
LSR (Logical Shift to the Right Direction)
Makes a logical right shift of the word data in "Ri" by "Rj" bits, stores the result to "Ri".
Only the lower 5 bits of "Rj", which designates the size of the shift, are valid and the
shift range is 0 to 31 bits.
Only the lower 5 bits of "Rj", which designates the size of the shift, are valid and the
shift range is 0 to 31 bits.
■
LSR (Logical Shift to the Right Direction)
Assembler format:
LSR Rj, Ri
Operation:
Ri >> Rj
→
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:
LSR R2, R3
N
Z
V
C
C
C
–
C
MSB
LSB
1
0
1
1
0
0
1
0
Rj
Ri
R2
R3
R2
R3
0 0 F F F F F F
0 0 0 0
0 0 0 8
F F F F F F F F
0 0 0 0
0 0 0 8
N Z V C
CCR
CCR
N Z V C
0 0 0 1
0 0 0 0
Before execution
After execution
Instruction bit pattern : 1011 0010 0010 0011