HCS12 datasheet(377/452 Pages) FREESCALE

377 / 452 page

S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

377

A.4 Notation Used in Instruction Set Summary

CPU Register Notation

Accumulator A — A or a

Index Register Y — Y or y

Accumulator B — B or b

Stack Pointer — SP, sp, or s

Accumulator D — D or d

Program Counter — PC, pc, or p

Index Register X — X or x

Condition Code Register — CCR or c

Explanation of Italic Expressions in Source Form Column

abc — A or B or CCR

abcdxys — A or B or CCR or D or X or Y or SP. Some assemblers also allow T2 or T3.

abd — A or B or D

abdxys — A or B or D or X or Y or SP

dxys — D or X or Y or SP

msk8 — 8-bit mask, some assemblers require # symbol before value

opr8i — 8-bit immediate value

opr16i — 16-bit immediate value

opr8a — 8-bit address used with direct address mode

opr16a — 16-bit address value

oprx0_xysp — Indexed addressing postbyte code:

oprx3,–xys Predecrement X or Y or SP by 1 . . . 8

oprx3,

+xys Preincrement X or Y or SP by 1 . . . 8

oprx3,xys– Postdecrement X or Y or SP by 1 . . . 8

oprx3,xys

+ Postincrement X or Y or SP by 1 . . . 8

oprx5,xysp 5-bit constant offset from X or Y or SP or PC

abd,xysp

Accumulator A or B or D offset from X or Y or SP or PC

oprx3 — Any positive integer 1 . . . 8 for pre/post increment/decrement

oprx5 — Any integer in the range –16 . . . +15

oprx9 — Any integer in the range –256 . . . +255

oprx16 — Any integer in the range –32,768 . . . 65,535

page — 8-bit value for PPAGE, some assemblers require # symbol before this value

rel8 — Label of branch destination within –128 to +127 locations

rel9 — Label of branch destination within –256 to +255 locations

rel16 — Any label within 64K memory space

trapnum — Any 8-bit integer in the range $30-$39 or $40-$FF

xys — X or Y or SP

xysp — X or Y or SP or PC

Operators

+ —

Addition

– —

Subtraction

• — Logical AND

+ — Logical OR (inclusive)

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