Maxim Integrated MAXQ Family - Manual (Page 207)

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MAXQ Family User’s Guide
(MAXQ10 Version) Shift Accumulator Left Arithmetically
SLA/SLA2/SLA4 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 7 Active Acc (Acc) 0
C ← Acc.7 ; Acc.[7:1]← Acc.[6:0] ; Acc.0 ← 0
Encoding: 15 0
Example(s): ; Acc = E3h, C=0, S=1, Z=0
SLA ; Acc = C6h, C=1, S=1, Z=0
SLA ; Acc = 8Ch, C=1, S=1, Z=0
SLA2 Operation: Carry Flag 7 Active Acc (Acc) 0
C ← Acc.6 ; Acc.[7:2]← Acc.[5:0] ; Acc.[1:0] ← 0
Encoding: 15 0
Example(s): ; Acc = E3h, C=0, S=1, Z=0
SLA2 ; Acc = 8Ch, C=1, S=1, Z=0
SLA4 Operation: Carry Flag 7 Active Acc (Acc) 0
C ← Acc.4 ; Acc.[7:4]← Acc.[3:0] ; Acc.[3:0] ← 0
Encoding: 15 0
Example(s): ; Acc = E3h, C=0, S=1, Z=0
SLA4 ; Acc = 30h, C=0, S=0, Z=0
1000 1010 0011 1010
0
1000 1010 0110 1010
0
0
1000 1010 0010 1010
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