User guide

DS4830A User’s Guide
224
RR / RRC Rotate Right Accumulator Carry Flag (Ex/In)clusive
Description: Rotates the active accumulator right by a single bit position. The RR instruction circulates
the lsb of the accumulator (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
1000
1010
1100
1010
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 Accumulator (Acc) 0 Carry Flag
Acc.[14:0] Acc.[15:1]; Acc.15  C; C  Acc.0
Encoding: 15 0
1000
1010
1101
1010
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