Filter
Top Products
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.
■ 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
NZVC
CC–C
MSB LSB
10110010 Rj Ri
R2
R3
R2
R3
00FF FFFF
0000 0008
FFFF FFFF
0000 0008
NZVC
CCR CCR
NZVC
00010000
Before execution After execution
Instruction bit pattern : 1011 0010 0010 0011