HCS12 datasheet(236/452 Pages) FREESCALE

236 / 452 page

Instruction Glossary

S12CPUV2 Reference Manual, Rev. 4.0

236

Freescale Semiconductor

Operation:

(M1) ⇒ M2

Description:

Moves the content of one memory location to another memory location. The

content of the source memory location is not changed.

Move instructions use separate addressing modes to access the source and

destination of a move. The following combinations of addressing modes are

supported: IMM–EXT, IMM–IDX, EXT–EXT, EXT–IDX, IDX–EXT, and

IDX–IDX. IDX operands allow indexed addressing mode specifications that

fit in a single postbyte including 5-bit constant, accumulator offsets, and

auto increment/decrement modes. Nine-bit and 16-bit constant offsets

would require additional extension bytes and are not allowed. Indexed

indirect modes (for example [D,r]) are also not allowed.

There are special considerations when using PC-relative addressing with

move instructions. These are discussed in 3.10 Instructions Using

Multiple Modes.

MOVB

Move a Byte of Data

from One Memory Location to Another

MOVB

CCR Details:

HIN

––––––––

Source Form(1)

1. The first operand in the source code statement specifies the source for the move.

Address

Mode

Object Code

Access Detail

HCS12

M68HC12

MOVB #opr8, opr16a

MOVB #opr8i, oprx0_xysp

MOVB opr16a, opr16a

MOVB opr16a, oprx0_xysp

MOVB oprx0_xysp, opr16a

MOVB oprx0_xysp, oprx0_xysp

IMM–EXT

IMM–IDX

EXT–EXT

EXT–IDX

IDX–EXT

IDX–IDX

18 0B ii hh ll

18 08 xb ii

18 0C hh ll hh ll

18 09 xb hh ll

18 0D xb hh ll

18 0A xb xb

OPwP

OPwO

OrPwPO

OPrPw

OrPwP

OrPwO

OPwP

OPwO

OrPwPO

OPrPw

OrPwP

OrPwO

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