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A8255 Datasheet(PDF) 3 Page - Altera Corporation

Part No. A8255
Description  PROGRAMMABLE PERIPHERAL INTERFACE ADAPTER
Download  13 Pages
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Maker  ALTERA [Altera Corporation]
Homepage  http://www.altera.com
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A8255 Datasheet(HTML) 3 Page - Altera Corporation

 
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Altera Corporation
47
a8255 Programmable Peripheral Interface Adapter Data Sheet
Functional
Description
Figure 2 shows a block diagram of the a8255.
Figure 2. a8255 Block Diagram
Data Output Select
Control Register Data
Port A
Output Register
Control Register
& Logic
reset
ncs
nrd
nwr
a[1..0]
din[7..0]
Data Output
Multiplexer
paen
pben
pcen[7..0]
dout[7..0]
Port A
Input Register
Port C
Output Register
& Control
Port B
Input Register
Port B
Output Register
Port Control Bus
paout[7..0]
pain[7..0]
pbout[7..0]
pbin[7..0]
pcout[7..0]
pcin[7..0]
Port C Status


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