Maxim-integrated MAXQ7667 Manual do Utilizador descarregar pdf (Página 342)

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MAXQ7667 User’s Guide

SR/SRA/SRA2/SRA4 Shift Accumulator Right/

Shift Accumulator Right Arithmetically

One, Two, or Four Times

Description: Shifts the active accumulator right once for the SR, SRA instructions and 2 or 4 times, respectively, for the SRA2,

SRA4 instructions. The SR instruction shifts a 0 into the accumulator msb while the SRA, SRA2, and SRA4 instruc-

tions effectively shift a copy of the current msb into the accumulator, thereby preserving any sign orientation. For

each shift iteration, the accumulator lsb is shifted into the Carry (C) flag.

Status Flags: C, S (changes for SR only), Z

SR Operation: 15 Active Accumulator (Acc) 0 Carry Flag

Acc.15

← 0; Acc.[14:0]← Acc.[15:1]; C ← Acc.0

Encoding: 15 0

Example(s): ; Acc = A345h, C=1, S=1, Z=0

SR ; Acc = 51A2h, C=1, S=0, Z=0

SR ; Acc = 28D1h, C=0, S=0, Z=0

SRA Operation: 15 Active Accumulator (Acc) 0 Carry Flag

Acc.[14:0]

← Acc.[15:1]

Acc.15

← Acc.15

← Acc.0

Encoding: 15 0

Example(s): ; Acc = 0003h, C=0, Z=0

SRA ; Acc = 0001h, C=1, Z=0

SRA ; Acc = 0000h, C=1, Z=1

1000 1010 1010 1010

1000 1010 1111 1010

1 2 ... 337 338 339 340 341 342 343 344 345 346 347

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