Maxim Integrated MAXQ Family - Manual (Page 206)

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MAXQ Family User’s Guide
(MAXQ20 Version) Rotate Right Accumulator
RR/RRC Carry Flag (Ex/In)clusive
Description: Rotates the active accumulator right by a single bit position. The RR instruction circulates the lsb of the accumula-
tor (bit 0) back to the msb (bit 15) while the RRC instruction includes the Carry (C) flag in the circular right shift.
Status Flags: C (for RRC only), S, Z (for RRC only)
RR Operation: 15 Active Accumulator (Acc) 0
Acc.[14:0] ← Acc.[15:1]; Acc.15 ← Acc.0
Encoding: 15 0
Example(s): ;Acc = A345h, S=1, Z=0
RR ; Acc = D1A2h, S=1, Z=0
RR ; Acc = 68D1h, S=0, Z=0
RRC Operation: 15 Active Acc (Acc) 0 Carry Flag
Acc.[14:0] ← Acc.[15:1]; Acc.15 ← C; C ← Acc.0
Encoding: 15 0
Example(s): ; Acc = A345h, C=1, S=1, Z=0
RRC ; Acc = D1A2h, C=1, S=1, Z=0
RRC ; Acc = E8D1h, C=0, S=1, Z=0
1000 1010 1100 1010
1000 1010 1101 1010
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