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Z80 Datasheet(PDF) 123 Page - Zilog, Inc.

Part # Z80
Description  Z80 CPU PERIPHERALS
PDF  330 Pages
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Manufacturer  ZILOG [Zilog, Inc.]
Direct Link  http://www.zilog.com
Logo ZILOG - Zilog, Inc.

Z80 Datasheet(HTML) 123 Page - Zilog, Inc.

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UM008101-0601
Direct Memory Access

Figure 45.
Write Register 5 Group
Write Register 6 Group
The base register byte for this group has bits 7, 1, and 0 set to one, which
Figure 46 depicts. The remaining bits specify 16 commands that are
commonly used after DMA initialization (for example, within CPU
interrupt service routines), and to point to a read mask for the read registers.
Each of these commands, except the ENABLE DMA command, disables
the DMA. Therefore, the ENABLE DMA command must be the last
command written before DMA bus requests can begin.
Reset (C3)
This command is used at power-up and when aborting a program sequence
to do the following:
• Disable interrupt and bus-request logic
• Reset interrupt latches
• Unforce a FORCE READY condition
• Reset the Auto Repeat function (see WR5)
• Reset the Wait function (See WR5)
D7 D6 D5 D4 D3 D2 D1 D0
Base Register Byte
0 = Ready Active Low
1 = Ready Active High
10
0
10
0 = Stop on End-of-Block
1 = Auto Restart on End-of-Block
0 =CE Only
1 =CE/WAIT Only



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