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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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SH7708 数据表(PDF) 40 Page - Renesas Technology Corp |
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SH7708 数据表(HTML) 40 Page - Renesas Technology Corp |
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40 / 633 page  22 2.3.2 Addressing Modes Addressing modes and effective address calculation methods are shown in table 2.2. Table 2.2 Addressing Modes and Effective Addresses Addressing Mode Instruction Format Effective Address Calculation Method Calculation Formula Register direct Rn Effective address is register Rn. (Operand is register Rn contents.) — Register indirect @Rn Effective address is register Rn contents. Rn Rn Rn Register indirect with post-increment @Rn+ Effective address is register Rn contents. A constant is added to Rn after instruction execution: 1 for a byte operand, 2 for a word operand, 4 for a longword operand. Rn Rn 1/2/4 + Rn + 1/2/4 Rn After instruction execution Byte: Rn + 1 → Rn Word: Rn + 2 → Rn Longword: Rn + 4 → Rn Register indirect with pre-decrement @–Rn Effective address is register Rn contents, decremented by a constant beforehand: 1 for a byte operand, 2 for a word operand, 4 for a longword operand. Rn 1/2/4 Rn – 1/2/4 – Rn – 1/2/4 Byte: Rn – 1 → Rn Word: Rn – 2 → Rn Longword: Rn – 4 → Rn (Instruction executed with Rn after calculation) |
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