Maxim Integrated MAXQ7667 - Manual (Page 341)

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MAXQ7667 User’s Guide
SLA/SLA2/SLA4 Shift Accumulator Left Arithmetically
One, Two, or Four Times
Description: Shifts the active accumulator left once, twice, or four times respectively for SLA, SLA2, and SLA4. For each shift iter-
ation, a 0 is shifted into the lsb, and the msb is shifted into the Carry (C) flag. For signed data, this shifting process
effectively retains the sign orientation of the data to the point at which overflow/underflow would occur.
Status Flags: C, S, Z
SLA Operation: Carry Flag 15 Active Accumulator (Acc) 0
C ← Acc.15; Acc.[15:1]← Acc.[14:0]; Acc.0 ← 0
Encoding: 15 0
Example(s): ; Acc = E345h, C=0, S=1, Z=0
SLA ; Acc = C68h, C=1, S=1, Z=0
SLA ; Acc = 8D14h, C=1, S=1, Z=0
SLA2 Operation: Carry Flag 15 Active Accumulator (Acc) 0
C ← Acc.14 ; Acc.[15:2]← Acc.[13:0] ; Acc.[1:0] ← 0
Encoding: 15 0
Example(s): ; Acc = E345h, C=0, S=1, Z=0
SLA2 ; Acc = 8D14h, C=1, S=1, Z=0
SLA4 Operation: Carry Flag 15 Active Accumulator (Acc) 0
C ← Acc.12; Acc.[15:4]← Acc.[11:0]; Acc.[3:0] ← 0
Encoding: 15 0
Example(s): ; Acc = E345h, C=0, S=1, Z=0
SLA4 ; Acc = 3450h, C=0, S=0, Z=0
0
1000 1010 0010 1010
1000 1010 0011 1010
0
1000 1010 1011 1010
0