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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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SH7080 数据表(PDF) 86 Page - Renesas Technology Corp |
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SH7080 数据表(HTML) 86 Page - Renesas Technology Corp |
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86 / 1644 page  Section 2 CPU Rev. 3.00 May 17, 2007 Page 28 of 1582 REJ09B0181-0300 2.3 Data Formats 2.3.1 Register Data Format The size of register operands is always longwords (32 bits). When loading byte (8 bits) or word (16 bits) data in memory into a register, the data is sign-extended to longword and stored in the register. Longword 31 0 Figure 2.2 Register Data Format 2.3.2 Memory Data Formats Memory data formats are classified into bytes, words, and longwords. Byte data can be accessed from any address. Locate, however, word data at an address 2n, longword data at 4n. Otherwise, an address error will occur if an attempt is made to access word data starting from an address other than 2n or longword data starting from an address other than 4n. In such cases, the data accessed cannot be guaranteed. The hardware stack area, pointed by the hardware stack pointer (SP, R15), uses only longword data starting from address 4n because this area holds the program counter and status register. Byte Byte Byte Byte Word Word Longword 31 23 15 7 Address m + 1 Address 2n Address 4n Address m Address m + 3 Address m + 2 0 Figure 2.3 Memory Data Format |
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