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A8255 Datasheet(PDF) 2 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) 2 Page - Altera Corporation

 
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Altera Corporation
a8255 Programmable Peripheral Interface Adapter Data Sheet
Table 1 describes the input and output ports of the a8255.
Table 1. a8255 Ports
Name
Type
Polarity
Description
clk
Input
Clock.
ncs
Input
Low
Chip select. When ncs is asserted, the a8255 is selected and read
and write transactions to internal registers are possible.
nrd
Input
Low
Read control. When nrd is asserted and the a8255 is selected, read
transactions from internal registers are possible.
nwr
Input
Low
Write control. When nwr is asserted and the a8255 is selected, write
transactions to internal registers are possible.
reset
Input
High
Reset. Initializes the control and port C output registers, and sets the
port A, B, and C registers to input mode.
a[1..0]
Input
High
Register address bus. This bus selects one of the internal registers.
din[7..0]
Input
High
Data input bus. The CPU writes data to the internal control, port A,
port B, or port C register via the din[7..0] bus.
pain[7..0]
Input
High
Port A input data bus.
pbin[7..0]
Input
High
Port B input data bus.
pcin[7..0]
Input
High
Port C input data bus.
paen
Output
High
Port A data enable. Output enable for the port A output data bus.
pben
Output
High
Port B data enable. Output enable for the port B output data bus.
dout[7..0]
Output
High
Data output bus. The CPU reads data from the internal control,
port A, port B, or port C register via the dout[7..0] bus.
paout[7..0]
Output
High
Port A output data bus.
pbout[7..0]
Output
High
Port B output data bus.
pcen[7..0]
Output
High
Port C data enable bus. Output enable for each bit of the port C
output data bus.
pcout[7..0]
Output
High
Port C output data bus.


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