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H8/3021 Datasheet(PDF) 48 Page - Renesas Technology Corp |
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H8/3021 Datasheet(HTML) 48 Page - Renesas Technology Corp |
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48 / 712 page  2. CPU Rev.2.00 Mar. 22, 2007 Page 24 of 684 REJ09B0352-0200 Rn En ERn Word data Word data Longword data General Register Data Type Data Format 15 0 MSB LSB 15 0 MSB LSB 31 16 MSB 15 0 LSB Legend ERn: En: Rn: MSB: LSB: General register General register E General register R Most significant bit Least significant bit Figure 2.7 General Register Data Formats 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. |
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