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H8/3028F 数据表(PDF) 56 Page - Renesas Technology Corp |
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H8/3028F 数据表(HTML) 56 Page - Renesas Technology Corp |
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56 / 923 page ![]() Rev. 2.00, 09/03, page 26 of 890 2.5.2 Memory Data Formats Figure 2.8 shows the data formats on memory. The H8/300H CPU can access word data and longword data on 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. 76543210 Address L Address L LSB MSB MSB LSB 70 MSB LSB 1-bit data Byte data Word data Longword data Address Data Type Data Format Address 2M Address 2M + 1 Address 2N Address 2N + 1 Address 2N + 2 Address 2N + 3 Figure 2.8 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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