HCS12 datasheet(83/452 Pages) FREESCALE

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S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

5.25 Pointer and Index Calculation Instructions

The load effective address instructions allow 5-, 8-, or 16-bit constants or the

contents of 8-bit accumulators A and B or 16-bit accumulator D to be added

to the contents of the X and Y index registers, or to the SP.

Table 5-25 is a summary of pointer and index instructions.

Table 5-25. Pointer and Index Calculation Instructions

Mnemonic

Function

Operation

LEAS

Load result of indexed addressing mode

effective address calculation

into stack pointer

± constant ⇒ SP or

(r)

+ (accumulator) ⇒ SP

r = X, Y, SP, or PC

LEAX

Load result of indexed addressing mode

effective address calculation

into x index register

± constant ⇒X or

(r)

+ (accumulator) ⇒X

r = X, Y, SP, or PC

LEAY

Load result of indexed addressing mode

effective address calculation

into y index register

± constant ⇒Y or

(r)

+ (accumulator) ⇒ Y

r = X, Y, SP, or PC

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