Maxim-integrated DS4830A Optical Microcontroller Instrukcja Użytkownika Pobierz pdf (Strona 225)

DS4830A User’s Guide

225

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 iteration, 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

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

Encoding: 15 0

1000

1010

0010

1010

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

SLA ; Acc = C68Ah, C=1, S=1, Z=0

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

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

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

Encoding: 15 0

1000

1010

0011

1010

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

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

Encoding: 15 0

1000

1010

0110

1010

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

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

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