Maxim Integrated MAX31782 - Manual (Page 209)

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