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參數(shù)資料
| 型號(hào)： | a8251 |
| 廠商： | Altera Corporation |
| 英文描述： | Programmable Communications Interface(可編程通信接口) |
| 中文描述： | 可編程通信接口（可編程通信接口） |
| 文件頁數(shù)： | 4/21頁 |
| 文件大?。?/td> | 338K |
| 代理商： | A8251 |
28
Altera Corporation
a8251 Programmable Communications Interface Data Sheet
The
a8251
contains the following registers:
I
I
I
I
I
I
I
Mode instruction
Command instruction
Status
Sync character one
Sync character two
Transmitter buffer
Receiver buffer
Mode Instruction Register
The mode instruction register (MIR) supports both synchronous and
asynchronous operation.
Bits 0 and 1 of the MIR are the baud rate factor bits and determine the ratio
between the data rate and the clocks. If bits 0 and 1 are set to a logic low,
then the
a8251
is programmed for synchronous operation; otherwise, the
a8251
operates asynchronously.
Asynchronous Operation
When the
a8251
is programmed for asynchronous operation, the MIR
contains the bits shown in
Table 2
.
Table 2. Mode Instruction Register Bits (Asynchronous Operation)
Data Bit
Signal Name
0
1
2
3
4
5
6
7
Baud rate factor (
b1
)
Baud rate factor (
b2
)
Word length select (
l1
)
Word length select (
l2
)
Parity select (
pen
)
Parity select (
ep
)
Stop bit select (
s1
)
Stop bit select (
s2
)
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