Maxim-integrated MAXQ622 Manual do Utilizador descarregar pdf (Página 231)

MAXQ612/MAXQ622 User’s Guide

Maxim Integrated 16-21

RR/RRC

Rotate Right Accumulator Carry Flag Exclusive/Inclusive

Description:

Rotates the active accumulator right by a single bit position. The RR instruction circulates the lsbit

of the accumulator (bit 0) back to the msbit (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:

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:

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 MAXQ622 Manual do Utilizador Página 231