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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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HCS12 数据表(PDF) 29 Page - Freescale Semiconductor, Inc |
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HCS12 数据表(HTML) 29 Page - Freescale Semiconductor, Inc |
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29 / 452 page  S12CPUV2 Reference Manual, Rev. 4.0 Freescale Semiconductor 29 3.1 Introduction Addressing modes determine how the central processor unit (CPU) accesses memory locations to be operated upon. This section discusses the various modes and how they are used. 3.2 Mode Summary Addressing modes are an implicit part of CPU12 instructions. Refer to Appendix A. Instruction Reference for the modes used by each instruction. All CPU12 addressing modes are shown in Table 3-1. The CPU12 uses all M68HC11 modes as well as new forms of indexed addressing. Differences between M68HC11 and M68HC12 indexed modes are described in 3.9 Indexed Addressing Modes. Instructions that use more than one mode are discussed in 3.10 Instructions Using Multiple Modes. 3.3 Effective Address Each addressing mode except inherent mode generates a 16-bit effective address which is used during the memory reference portion of the instruction. Effective address computations do not require extra execution cycles. Reference Manual — S12CPUV2 Section 3. Addressing Modes |
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