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參數(shù)資料
| 型號(hào)： | A16450 |
| 廠商： | Altera Corporation |
| 元件分類： | 通用總線功能 |
| 英文描述： | Universal Asynchronous Receiver/Transmitter |
| 中文描述： | 通用異步接收器/發(fā)送器 |
| 文件頁(yè)數(shù)： | 6/16頁(yè) |
| 文件大?。?/td> | 282K |
| 代理商： | A16450 |
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70
Altera Corporation
a16450 Universal Asynchronous Receiver/Transmitter Data Sheet
Receiver Buffer Register
The receiver buffer register is a read-only register that contains the last
complete data word sample received by the
a16450
.
Transmitter Holding Register
The transmitter holding register is a write-only register that loads the next
data byte to be transmitted by the
a16450
.
Divisor Register
The divisor register controls the programmable baud rate generator. The
16-bit divisor performs an integer frequency divide of the input clock. The
nbaudout
output becomes the transmitter clock that operates at 16 times
the baud rate clock. For example, if the input clock is 10 MHz and the
divisor register is set to a binary 2 (
0000000000000010
), the
nbaudout
will be a 5-MHz output with a 50/50 duty cycle. The effective baud rate
will be 1/16th of 5 MHz, or 312,500 baud. In addition, the
nbaudout
output may be wrapped to the receiver section input clock (
rclk
) to
provide the receiver clock that operates at 16 times the baud rate clock.
The
a16450
does not support a divide-by-0 operation, which produces
the same results as a divide-by-1 operation for the
nbaudout
output.
However, a divide-by-0 operation prevents the transmitter from
functioning because an internal signal,
baud_en
, is not generated. The
baud_en
signal enables the clock in the transmitter.
Interrupt Enable Register
The
a16450
supports interrupts from four different sources; the interrupt
enable register selectively enables or disables interrupts from each of
these sources. When a bit is reset to a logic low, the
a16450
will not
recognize interrupts from that source.
Table 3
shows the interrupt enable
register format.
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| a16450 | Universal Asynchronous Receiver/Transmitter(通用異步接收/傳送器) |
| A170 | SILICON RECTIFIER |
| A170R | SILICON RECTIFIER |
| A180 | SILICON RECTIFIER |
| A180R | SILICON RECTIFIER |
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