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Z80 Datasheet(PDF) 189 Page - Zilog, Inc. |
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Z80 Datasheet(HTML) 189 Page - Zilog, Inc. |
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189 / 330 page  < %27 2GTKRJGTCNU 7UGT /CPWCN UM008101-0601 Direct Memory Access REGISTER BIT FUNCTIONS Write Register Bit Functions Figure 76. Write Register 0 Group Figure 77. Write Register 1 Group D7 D6 D5 D4 D3 D2 D1 D0 Base Register Byte Port A Starting Address 00 0 1 1 1 0 1 Do not use =Transfer =Search = Search/Transfer 0 =PortB → Port A 0 =PortA → Port B (Low Byte) Port A Starting Address (High Byte) Block Length (Low Byte) Block Length (High Byte) D7 D6 D5 D4 D3 D2 D1 D0 Base Register Byte 00 0 1 1 1 0 1 = Port A Address Decrements 0 = Port A is Memory 0 = Port A is I/O Port A Variable 00 0 1 1 1 0 1 = Cycle Length = 3 = Cycle Length = 2 =Do Not Use = Port A Address Increments = Port A Address Fixed Timing Byte = Cycle Length = 4 WR Ends 1/2 Cycle Early = 0 RD Ends 1/2 Cycle Early = 0 MREQ Ends 1/2 Cycle Early = 0 0 = IORQ Ends 1/2 Cycle Early 00 00 1 0 |
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