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A8255 Datasheet(PDF) 4 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) 4 Page - Altera Corporation

 
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Altera Corporation
a8255 Programmable Peripheral Interface Adapter Data Sheet
Register Address Map
Table 2 shows the register address map for the a8255.
Registers
This section describes the following a8255 registers:
s
Control
s
Port A, B & C
Control Register
The control register sets the mode and signal direction for the three 8-bit
I/O ports. Control of the I/O ports is split into two groups. Group A
consists of port A and the upper four bits of port C; group B consists of
port B and the lower four bits of port C. Group A can be set to mode 0,
mode 1, or mode 2, but group B can be set to only mode 0 or mode 1.
Writing to the control register address with bit 7 set is the mode definition
format, which allows control of the mode and direction of the three I/O
ports (see Table 3). Writing to the control register address with bit 7 reset
is the port C bit set/reset format, which allows single-bit control of port C
(see Table 4). The CPU reads the control register using the mode
definition format.
Table 2. Register Address Map
a1
a0
Register
0
0
Port A data (all modes)
0
1
Port B data (all modes)
1
0
Port C data (mode 0) and status (modes 1 and 2)
1
1
Control register mode definition and port C bit set/reset


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