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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 5/13頁 |
| 文件大?。?/td> | 250K |
| 代理商： | A8255 |
Altera Corporation
49
a8255 Programmable Peripheral Interface Adapter Data Sheet
Note:
(1)
The X indicates “don’t care.”
Notes:
(1)
For example, to reset bit 3 of port C, bit 7 is reset to indicate that the write is in the
port C bit set/reset format. Bits 6 through 4 are “don’t care.” Bits 3 through 1 are
011 to address bit 3, and bit 0 is 0 to indicate a reset operation. The complete data
word is 0XXX0110.
The X indicates “don’t care.”
(2)
Table 3. Control Register Mode Definition Format
Bit
Description
0
Port C (lower) I/O direction:
1 = input
0 = output
Port B I/O direction:
1 = input
0 = output
Group B mode select:
1 = mode 1
0 = mode 0
Port C (upper) I/O direction:
1 = input
0 = output
Port A I/O direction:
1 = input
0 = output
Group A mode select:
00 = mode 0
01 = mode 1
1X = mode 2,
Note (1)
1 when writing = mode definition format
Always 1 when reading the control register
1
2
3
4
6..5
7
Table 4. Port C Bit Set/Reset Format
Note (1)
Bit
Description
0
Bit set/reset:
1 = set
0 = reset
Bit select address
XXX,
Note (2)
0 when writing = port C bit set/reset format
3..1
6..4
7
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