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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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HD64F2149YV 数据表(PDF) 77 Page - Renesas Technology Corp |
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HD64F2149YV 数据表(HTML) 77 Page - Renesas Technology Corp |
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77 / 1075 page  Section 2 CPU Rev. 3.00 Jan 18, 2006 page 49 of 1044 REJ09B0280-0300 2.5.2 Memory Data Formats Figure 2.11 shows the data formats in memory. The CPU can access word data and longword data in memory, but word or longword data must begin at an even address. If an attempt is made to access word or longword data at an odd address, no address error occurs but the least significant bit of the address is regarded as 0, so the access starts at the preceding address. This also applies to instruction fetches. 7 654 3 2 10 70 MSB LSB MSB LSB MSB LSB Data Type Data Format 1-bit data Byte data Word data Longword data Address Address L Address L Address 2M Address 2M + 1 Address 2N Address 2N + 1 Address 2N + 2 Address 2N + 3 Figure 2.11 Memory Data Formats When ER7 (SP) is used as an address register to access the stack, the operand size should be word size or longword size. |
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