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A8255 Datasheet(PDF) 6 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) 6 Page - Altera Corporation

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Altera Corporation
a8255 Programmable Peripheral Interface Adapter Data Sheet
Port A, B & C Registers
Depending on the configured input and output directions that are set in
the control register, the microprocessor either reads or writes data
to/from the port A, B, or C registers. Ports A and B have separate input
and output registers.
In mode 0, the port C register functions identically to the port A and B
registers. In modes 1 and 2, the port C register has a specialized role; a
write to port C has no effect—the register bits must be altered individually
using the port C bit set/reset format. Reading the port C status bits in
modes 1 or 2 provides the CPU with the status of the control signals and
flags, as shown in Tables 5 through 7. However, the modes and port
directions can be mixed in more combinations than these tables illustrate.
Notes:
(1)
These bits are defined in Table 9.
(2)
Bits 6 and 7 effectively operate in mode 0. The I/O direction is dependent on bit 3
of the control register.
Table 5. Port C Status Bits with Ports A & B in Mode 1 Input
Note (1)
Bit
Signal
Description
0
intrb
Port B interrupt request
1
ibfb
Port B input buffer full flag
2
inteb
Port B interrupt enable
3
intra
Port A interrupt request
4
intea
Port A interrupt enable
5
ibfa
Port A input buffer full flag
6
I/O
Note (2)
7
I/O
Note (2)


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