Maxim-integrated MAXQ7667 Manual do Utilizador descarregar pdf (Página 341)

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MAXQ7667 User’s Guide

SLA/SLA2/SLA4 Shift Accumulator Left Arithmetically

One, Two, or Four Times

Description: Shifts the active accumulator left once, twice, or four times respectively for SLA, SLA2, and SLA4. For each shift iter-

ation, a 0 is shifted into the lsb, and the msb is shifted into the Carry (C) flag. For signed data, this shifting process

effectively retains the sign orientation of the data to the point at which overflow/underflow would occur.

Status Flags: C, S, Z

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

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

Encoding: 15 0

Example(s): ; Acc = E345h, C=0, S=1, Z=0

SLA ; Acc = C68h, C=1, S=1, Z=0

SLA ; Acc = 8D14h, C=1, S=1, Z=0

SLA2 Operation: Carry Flag 15 Active Accumulator (Acc) 0

← Acc.14 ; Acc.[15:2]← Acc.[13:0] ; Acc.[1:0] ← 0

Encoding: 15 0

Example(s): ; Acc = E345h, C=0, S=1, Z=0

SLA2 ; Acc = 8D14h, C=1, S=1, Z=0

SLA4 Operation: Carry Flag 15 Active Accumulator (Acc) 0

← Acc.12; Acc.[15:4]← Acc.[11:0]; Acc.[3:0] ← 0

Encoding: 15 0

Example(s): ; Acc = E345h, C=0, S=1, Z=0

SLA4 ; Acc = 3450h, C=0, S=0, Z=0

1000 1010 0010 1010

1000 1010 0011 1010

1000 1010 1011 1010

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Maxim-integrated MAXQ7667 Manual do Utilizador Página 341