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(yè)數(shù)： 8/21頁(yè)
文件大小： 338K
代理商： A8251
32
Altera Corporation
a8251 Programmable Communications Interface Data Sheet
Command Instruction Register
The command instruction register controls transmitter/receiver
operations.
Table 8
shows the format, signal name, and function of the
command instruction register data bits.
Status Register
The status register allows the microprocessor, or other controlling device,
to examine the condition of the
a8251
.
Table 9
shows the format, signal
name, and function of the status register data bits.
Table 8. Command Instruction Register Format
Data Bit
Signal Name
Function
0
1
2
3
4
5
6
7
Transmitter enable (
txen
)
Data terminal ready (
dtr
)
Receiver enable (
rxe
)
Send break character (
sbrk
)
Error reset (
er
)
Request to send (
rts
)
Internal reset (
ir
)
Enter hunt (
eh
)
A logic high enables the transmitter.
A logic high forces the
ndtr
signal to go low.
A logic high enables the receiver.
A logic high forces the
txd
signal to go low.
A logic high resets all error signals (
pe
,
oe
,
fe
).
A logic high forces the
nrts
signal to go low.
A logic high forces an internal state reset operation.
A logic high causes the receiver to “hunt” for sync characters.
The
eh
command is ignored during asynchronous operation.
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