HCS12 datasheet(378/452 Pages) FREESCALE

378 / 452 page

S12CPUV2 Reference Manual, Rev. 4.0

378

Freescale Semiconductor

Operators (continued)

⊕ — Logical exclusive OR

× — Multiplication

÷ — Division

M —

Negation. One’s complement (invert each bit of M)

: —

Concatenate

Example: A : B means the 16-bit value formed by concatenating 8-bit accumulator A

with 8-bit accumulator B.

A is in the high-order position.

⇒ — Transfer

Example: (A)

⇒ M means the content of accumulator A is transferred to memory

location M.

⇔ — Exchange

Example: D

⇔ X means exchange the contents of D with those of X.

Address Mode Notation

INH — Inherent; no operands in object code

IMM — Immediate; operand in object code

DIR — Direct; operand is the lower byte of an address from $0000 to $00FF

EXT — Operand is a 16-bit address

REL — Two’s complement relative offset; for branch instructions

IDX — Indexed (no extension bytes); includes:

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

Pre/post increment/decrement by 1 . . . 8

Accumulator A, B, or D offset

IDX1 — 9-bit signed offset from X, Y, SP, or PC; 1 extension byte

IDX2 — 16-bit signed offset from X, Y, SP, or PC; 2 extension bytes

[IDX2] — Indexed-indirect; 16-bit offset from X, Y, SP, or PC

[D, IDX] — Indexed-indirect; accumulator D offset from X, Y, SP, or PC

Machine Coding

— 8-bit direct address $0000 to $00FF. (High byte assumed to be $00).

— High-order byte of a 16-bit constant offset for indexed addressing.

— Exchange/Transfer post-byte. See Table A-5 on page 399.

— Low-order eight bits of a 9-bit signed constant offset for indexed addressing,

or low-order byte of a 16-bit constant offset for indexed addressing.

— High-order byte of a 16-bit extended address.

— 8-bit immediate data value.

— High-order byte of a 16-bit immediate data value.

— Low-order byte of a 16-bit immediate data value.

— Loop primitive (DBNE) post-byte. See Table A-6 on page 400.

— Low-order byte of a 16-bit extended address.

— 8-bit immediate mask value for bit manipulation instructions.

Set bits indicate bits to be affected.

— Program page (bank) number used in CALL instruction.

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