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SH7263 数据表(PDF) 86 Page - Renesas Technology Corp |
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SH7263 数据表(HTML) 86 Page - Renesas Technology Corp |
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86 / 1862 page ![]() Section 2 CPU Rev. 2.00 Mar. 14, 2008 Page 52 of 1824 REJ09B0290-0200 2.3.2 Addressing Modes Addressing modes and effective address calculation are as follows: Table 2.8 Addressing Modes and Effective Addresses Addressing Mode Instruction Format Effective Address Calculation Equation Register direct Rn The effective address is register Rn. (The operand is the contents of register Rn.) — Register indirect @Rn The effective address is the contents of register Rn. Rn Rn Rn Register indirect with post- increment @Rn+ The effective address is the contents of register Rn. A constant is added to the contents of Rn after the instruction is executed. 1 is added for a byte operation, 2 for a word operation, and 4 for a longword operation. 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 The effective address is the value obtained by subtracting a constant from Rn. 1 is subtracted for a byte operation, 2 for a word operation, and 4 for a longword operation. 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 is executed with Rn after this calculation) |
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