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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT83SND1CXXX-ROTIL 데이터시트(PDF) 132 Page - ATMEL Corporation |
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AT83SND1CXXX-ROTIL 데이터시트(HTML) 132 Page - ATMEL Corporation |
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132 / 212 page  132 4109J–8051–10/06 AT8xC51SND1C Table 111. External Data Memory Interface Signals 16.2 Registers Table 112. DAT16H Register DAT16H (S:F9h) – Data 16 High Order Byte Reset Value =XXXX XXXXb Signal Name Type Description Alternate Function A15:8 I/O Address Lines Upper address lines for the external bus. Multiplexed higher address and data lines for the IDE interface. P2.7:0 AD7:0 I/O Address/Data Lines Multiplexed lower address and data lines for the IDE interface. P0.7:0 ALE O Address Latch Enable ALE signals indicates that valid address information is available on lines AD7:0. - RD O Read Read signal output to external data memory. P3.7 WR O Write Write signal output to external memory. P3.6 7654 3210 D15 D14 D13 D12 D11 D10 D9 D8 Bit Number Bit Mnemonic Description 7 - 0 D15:8 Data 16 High Order Byte When EXT16 bit is set, DAT16H is set by software with the high order data Byte prior any MOVX write instruction. When EXT16 bit is set, DAT16H contains the high order data Byte after any MOVX read instruction. |
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