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HCS12 数据表(PDF) 16 Page - Freescale Semiconductor, Inc |
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HCS12 数据表(HTML) 16 Page - Freescale Semiconductor, Inc |
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16 / 452 page ![]() S12CPUV2 Reference Manual, Rev. 4.0 16 Freescale Semiconductor 1.3 Symbols and Notation The symbols and notation shown here are used throughout the manual. More specialized notation that applies only to the instruction glossary or instruction set summary are described at the beginning of those sections. 1.3.1 Abbreviations for System Resources A — Accumulator A B — Accumulator B D — Double accumulator D (A : B) X — Index register X Y — Index register Y SP — Stack pointer PC — Program counter CCR — Condition code register S — STOP instruction control bit X — Non-maskable interrupt control bit H — Half-carry status bit I — Maskable interrupt control bit N — Negative status bit Z — Zero status bit V — Two’s complement overflow status bit C — Carry/Borrow status bit |
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