Texas Instruments TMS320C3x User Manual
Page 662
ROL
Rotate Left
13-204
Syntax
ROL
dst
Operation
dst left-rotated 1 bit
→
dst
Operands
dst register (Rn, 0
≤
n
≤
27)
Opcode
31
24 23
16
8 7
0
15
0 0 0
1 0
1
0
1
0
dst
1 1
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
Description
The contents of the
dst operand are left rotated one bit and loaded into the dst
register. This is a circular rotation, with the MSB simultaneously transferred
into the carry (C) bit and the LSB.
Rotate left:
C
dst
Cycles
1
Status Bits
These condition flags are modified only if the destination register is R7 – R0.
LUF
Unaffected
LV
Unaffected
UF
0
N
MSB of the output
Z
1 if a 0 output is generated; 0 otherwise
V
0
C
Set to the value of the bit rotated out of the high-order bit; unaffected
if
dst is not R7 – R0
OVM
Operation is not affected by OVM bit value.
Example
ROL R3
Before Instruction
After Instruction
R3
00 8002 5CD4
R3
00 0004 B9A9
LUF
0
LUF
0
LV
0
LV
0
UF
0
UF
0
N
0
N
0
Z
0
Z
0
V
0
V
0
C
0
C
1
Mode Bit