參數(shù)資料
型號: CD1284
廠商: Intel Corp.
英文描述: IEEE 1284-Compatible Parallel Interface Controller with Two High-Speed Asynchronous Serial Ports
中文描述: 符合IEEE 1284兼容并行接口控制器兩個高速異步串行端口
文件頁數(shù): 69/176頁
文件大?。?/td> 2255K
代理商: CD1284
IEEE 1284-Compatible Parallel Interface Controller
CD1284
Datasheet
69
the selected character is transmitted immediately following the currently transmitting character and
any character in the Transmitter Holding register. This preempts any characters in the transmit
FIFO. If there are characters in the transmit FIFO, transmission resumes after the special character
is sent.
One important use of this command is that it allows the CPU to flow-control a remote without
having to wait for the transmit FIFO to empty before the flow control character is placed in it. This
is a special case different from the normal transmitter operation of the CD1284, in that the
character can be sent without waiting for a transmit service request. The only requirement is that
the transmitter
must
be enabled (interrupts need not be enabled).
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