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參數(shù)資料
| 型號(hào)： | A8255 |
| 廠商： | Altera Corporation |
| 英文描述： | PROGRAMMABLE PERIPHERAL INTERFACE ADAPTER |
| 中文描述： | 可編程外圍接口適配器 |
| 文件頁(yè)數(shù)： | 7/13頁(yè) |
| 文件大小： | 250K |
| 代理商： | A8255 |
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Altera Corporation
51
a8255 Programmable Peripheral Interface Adapter Data Sheet
Notes:
(1)
(2)
These bits are defined in
Table 9
.
Bits 4 and 5 effectively operate in mode 0. The I/O direction is dependent on bit 3
of the control register.
Notes:
(1)
(2)
These bits are defined in
Table 11
.
Depending on the lower three bits of the control register, bits 0 through 2 either
operate in mode 0 or function as status bits for port B in mode 1.
Operation
The
a8255
operates in the following three modes:
I
I
I
Mode 0: basic input/output
Mode 1: strobed input/output
Mode 2: strobed bidirectional bus
Table 6. Port C Status Bits with Ports A & B in Mode 1 Output
Note (1)
Bit
Signal
Description
0
1
2
3
4
5
6
7
intrb
Port B interrupt request
Port B output buffer full flag
Port B interrupt enable
Port A interrupt request
Note (2)
Note (2)
Port A interrupt enable
Port A output buffer full flag
nobfb
inteb
intra
I/O
I/O
intea
nobfa
Table 7. Port C Status Bits with Port A in Mode 2
Note (1)
Bit
Signal
Description
0
1
2
3
4
5
6
7
–
–
–
Note (2)
Note (2)
Note (2)
Port A interrupt request
Interrupt enable 2
Port A input buffer full flag
Interrupt enable 1
Port A output buffer full flag
intra
inte2
ibfa
inte1
nobfa
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