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HCS12 Datasheet(PDF) 102 Page - Freescale Semiconductor, Inc |
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HCS12 Datasheet(HTML) 102 Page - Freescale Semiconductor, Inc |
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102 / 452 page  S12CPUV2 Reference Manual, Rev. 4.0 102 Freescale Semiconductor Operation: (B) + (Y) ⇒ Y Description: Adds the 8-bit unsigned content of accumulator B to the content of index register Y considering the possible carry out of the low-order byte of Y; places the result in Y. The content of B is not changed. This mnemonic is implemented by the LEAY B,Y instruction. The LEAY instruction allows A, B, D, or a constant to be added to Y. For compatibility with the M68HC11, the mnemonic ABY is translated into the LEAY B,Y instruction by the assembler. ABY Add Accumulator B to Index Register Y ABY CCR Details: S X HIN Z V C –––––––– Source Form Address Mode Object Code Access Detail HCS12 M68HC12 ABY translates to... LEAY B,Y IDX 19 ED Pf PP (1) 1. Due to internal M68HC12CPU requirements, the program word fetch is performed twice to the same address during this instruction. |
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