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H8/3028F 数据表(PDF) 230 Page - Renesas Technology Corp |
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H8/3028F 数据表(HTML) 230 Page - Renesas Technology Corp |
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230 / 923 page ![]() Rev. 2.00, 09/03, page 200 of 890 7.3 Register Descriptions (2) (Full Address Mode) In full address mode the A and B channels operate together. Full address mode is selected as indicated in table 7.4. 7.3.1 Memory Address Registers (MAR) A memory address register (MAR) is a 32-bit readable/writable register. MARA functions as the source address register of the transfer, and MARB as the destination address register. An MAR consists of four 8-bit registers designated MARR, MARE, MARH, and MARL. All bits of MARR are reserved; they cannot be modified and are always read as 1. (Write is invalid.) Bit Initial value Read/Write 31 — Source or destination address 30 — 29 — 28 — 27 — 26 — 25 — 24 — 23 R/W 22 R/W 21 R/W 20 R/W 19 R/W 18 R/W 17 R/W 16 R/W 15 R/W 14 R/W 13 R/W 12 R/W 11 R/W 10 R/W 9 R/W 8 R/W 7 R/W 6 R/W 5 R/W 4 R/W 3 R/W 2 R/W 1 R/W 0 R/W MARR MARE MARH MARL Undetermined The MAR value is incremented or decremented each time one byte or word is transferred, automatically updating the source or destination memory address. For details, see section 7.3.4, Data Transfer Control Registers (DTCR). The MARs are not initialized by a reset or in standby mode. 7.3.2 I/O Address Registers (IOAR) The I/O address registers (IOARs) are not used in full address mode. |
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