MaximIntegrated 20-26
MAX31782 User’s Guide
Revision 0; 8/11
SR/SRA/SRA2/SRA4
ShiftAccumulatorRight/ShiftAccumulatorRightArithmetically
One,Two,orFourTimes
Description:
Shifts the active accumulator right once for the SR, SRA instructions and 2 or 4 times, respectively,
for the SRA2, SRA4 instructions . The SR instruction shifts a 0 into the accumulator msb while the
SRA, SRA2, and SRA4 instruc- tions effectively shift a copy of the current msb into the accumulator,
thereby preserving any sign orientation . For each shift iteration, the accumulator lsb is shifted into
the Carry (C) flag .
StatusFlags:
C, S (changes for SR only), Z
SROperation:
15
Active Accumulator (Acc)
0 Carry Flag
0
Acc .15
←
0;
Acc .[14:0]
←
Acc .[15:1];
C
←
Acc .0
Encoding:
15
0
1000
1010
1010
1010
Example(s):
; Acc = A345h, C=1, S=1, Z=0
SR
; Acc = 51A2h, C=1, S=0, Z=0
SR
; Acc = 28D1h, C=0, S=0, Z=0
SRAOperation:
15
Active Accumulator (Acc)
0 Carry Flag
Acc .[14:0]
←
Acc .[15:1]
Acc .15
←
Acc .15
C
←
Acc .0
Encoding:
15
0
1000
1010
1111
1010
Example(s):
; Acc = 0003h, C=0, Z=0
SRA
; Acc = 0001h, C=1, Z=0
SRA
; Acc = 0000h, C=1, Z=1
