Rorc – Texas Instruments TMS320C3x User Manual
Page 666
RORC
Rotate Right Through Carry
13-208
Syntax
RORC
dst
Operation
dst right-rotated one bit through carry bit
→
dst
Operands
dst register (Rn, 0
≤
n
≤
27)
Opcode
31
24 23
16
8 7
0
15
0 0 0
1 0
1
1
0
0
dst
1 1
1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 1
Description
The contents of the
dst operand are right rotated one bit through the status reg-
ister’s carry (C) bit. This could be viewed as a 33-bit shift. The carry bit value
is rotated into the MSB of the
dst, while at the same time the dst LSB is rotated
into the carry bit.
Rotate right through carry bit:
dst
C
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; if
dst is not
R7 – R0, then C is shifted in but not changed
OVM
Operation is not affected by OVM bit value.
Example
RORC R4
Before Instruction
After Instruction
R4
00 8000 0081
R4
00 4000 0040
LUF
0
LUF
0
LV
0
LV
0
UF
0
UF
0
N
1
N
0
Z
0
Z
0
V
0
V
0
C
0
C
1
Mode Bit