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Z80 Datasheet(PDF) 113 Page - Zilog, Inc. |
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Z80 Datasheet(HTML) 113 Page - Zilog, Inc. |
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113 / 330 page  < %27 2GTKRJGTCNU 7UGT /CPWCN UM008101-0601 Direct Memory Access Figure 40. Write Register 0 Group Block Length All operations must have a declared block length because the default values at power-up are unpredictable for block length. These registers are written to by setting pointer bits 5 and 6 in the WR0 base register byte. The block length can be up to 64 Kbytes. Due to the pipelining method of reading in data, the number of bytes actually searched or transferred may be one or two more than the number entered here. “Address and Byte Counting” on page 75 in “Internal Structure” on page 71 describes this (Table 11). Programming a block length of zero results in the transfer or search of 216 + 1 bytes. Therefore, the shortest block length that can be entered is 1, which usually results in a transfer or search of two bytes (Table 12). D7 D6 D5 D4 D3 D2 D1 D0 Base Register Byte Port A starting address (Low Byte) Port A starting address (High Byte) Block length (Low Byte) Block length (High Byte) 00 0 1 1 1 0 1 Do not use =Transfer =Search = Search/Transfer 0 =PortB → Port A 0 =PortA → Port B |
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