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Z80 Datasheet(PDF) 190 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) 190 Page - Zilog, Inc.

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<%27 2GTKRJGTCNU
7UGT /CPWCN
UM008101-0601
Direct Memory Access

Figure 78.
Write Register 2 Group
Figure 79.
Write Register 3 Group
D7 D6 D5 D4 D3 D2 D1 D0
Base Register Byte
00
0
1
1
1
0
1
= Port B Address Decrements
0 = Port B is Memory
1 = Port B is I/O
Port B Variable
00
0
1
1
1
0
1
= Cycle Length = 3
= Cycle Length = 2
=Do Not Use
= Port B Address Increments
= Port B 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
0
0
D7 D6 D5 D4 D3 D2 D1 D0
Base Register Byte
Mask Byte (0 = Compare)
00
0
DMA Enable = 1
Interrupt Enable = 1
1= Stop on Match
Match Byte



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