Texas Instruments TMS320C2XX User Manual
Page 311
SFR
Shift Accumulator Right
7-158
Syntax
SFR
Operands
None
Opcode
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
0
1
0
0
0
0
0
1
1
1
1
1
0
1
Execution
Increment PC, then ...
If SXM = 0
Then 0
→
ACC(31).
If SXM = 1
Then (ACC(31))
→
ACC(31)
(ACC(31:1))
→
ACC(30:0)
(ACC(0))
→
C
Status Bits
Affected by
Affects
SXM
C
Description
The SFR instruction shifts the accumulator right one bit.
-
If SXM = 1, the instruction produces an arithmetic right shift. The sign bit
(MSB) is unchanged and is also copied into bit 30. Bit 0 is shifted into the
carry bit (C).
-
If SXM = 0, the instruction produces a logic right shift. All of the accumula-
tor bits are shifted right by one bit. The least significant bit is shifted into
the carry bit, and the most significant bit is filled with a 0.
Words
1
Cycles for a Single SFR Instruction
ROM
DARAM
SARAM
External
1
1
1
1+p
Cycles for a Repeat (RPT) Execution of an SFR Instruction
ROM
DARAM
SARAM
External
n
n
n
n+p
Cycles