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HCS12 Datasheet(PDF) 83 Page - Freescale Semiconductor, Inc |
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HCS12 Datasheet(HTML) 83 Page - Freescale Semiconductor, Inc |
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83 / 452 page  S12CPUV2 Reference Manual, Rev. 4.0 Freescale Semiconductor 83 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 r ± 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 r ± 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 r ± constant ⇒Y or (r) + (accumulator) ⇒ Y r = X, Y, SP, or PC |
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