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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

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Maxim-integrated DS4830A Optical Microcontroller Manuale Utente Pagina 224