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參數(shù)資料
| 型號： | 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)： | 14/21頁 |
| 文件大小： | 338K |
| 代理商： | A8251 |
38
Altera Corporation
a8251 Programmable Communications Interface Data Sheet
Transmitter Operation (Asynchronous)
When the
a8251
is programmed for asynchronous operation, the
transmitter includes the following functions:
I
I
I
I
I
Transmitter data register write/transfer
Transmitter start bit
Transmitter data
Transmitter parity bit
Transmitter stop bit
Transmitter Data Register Write/Transfer
After a total state reset operation and when bit 1 (
txen
) of the command
instruction register is high, a transmit operation begins when the
ncts
signal is asserted. At this point, a data byte can be written to the TBR.
However, if no data is written, the
txd
signal is held in a logic high state.
In the initial write operation, if the shift register is empty, the data is
immediately transferred and the shift operation begins. If a shift operation
is underway, the microprocessor can write to the TBR; however, the data
is not transferred to the shift register until the active shift operation is
finished.
When the TBR contains data that has not been transferred to the shift
register, the
txrdy
signal and corresponding status bit go low. Once the
data is transferred to the shift register and the TBR is empty, the
txrdy
signal and corresponding status bit will again be asserted. If both the shift
register and TBR become empty, the
txempty
signal and corresponding
status bit will be asserted. See
Figure 5
.
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