HCS12 datasheet(66/452 Pages) FREESCALE

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S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

5.14 Shift and Rotate Instructions

There are shifts and rotates for all accumulators and for memory bytes. All

pass the shifted-out bit through the C status bit to facilitate multiple-byte

operations. Because logical and arithmetic left shifts are identical, there are

no separate logical left shift operations. Logic shift left (LSL) mnemonics are

assembled as arithmetic shift left memory (ASL) operations. Table 5-12

shows shift and rotate instructions.

Table 5-12. Shift and Rotate Instructions

Mnemonic

Function

Operation

Logical Shifts

LSL

LSLA

LSLB

Logic shift left memory

Logic shift left A

Logic shift left B

LSLD

Logic shift left D

LSR

LSRA

LSRB

Logic shift right memory

Logic shift right A

Logic shift right B

LSRD

Logic shift right D

Arithmetic Shifts

ASL

ASLA

ASLB

Arithmetic shift left memory

Arithmetic shift left A

Arithmetic shift left B

ASLD

Arithmetic shift left D

ASR

ASRA

ASRB

Arithmetic shift right memory

Arithmetic shift right A

Arithmetic shift right B

Rotates

ROL

ROLA

ROLB

Rotate left memory through carry

Rotate left A through carry

Rotate left B through carry

ROR

RORA

RORB

Rotate right memory through carry

Rotate right A through carry

Rotate right B through carry

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