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): 120/176頁
文件大?。?/td> 2255K
代理商: CD1284
CD1284
IEEE 1284-Compatible Parallel Interface Controller
120
Datasheet
7.3.1.3
Format 3
Send Special Character Command
This command causes one of the pre-programmed characters in the special character registers
(SCHR1, SCHR2, SCHR3, and SCHR4) to be sent preemptively (applies to the serial channels
only). The character sent is selected by the settings of bits 2 through 0.
Preemptively
means that
the special character is sent immediately following the character in the Transmitter Holding
register; it does not wait until the FIFO empties. Once the special character is sent, transmission of
any characters remaining in the FIFO proceeds normally.
Bit
Description
7
This bit must always be
0
.
6
This bit must always be
1
.
5:4
These bits must always be
0
.
3:1
These three bits are encoded as:
0
This bit must always be
0
.
Bit 7
0
Bit 6
0
Bit 5
Send SC
Bit 4
0
Bit 3
0
Bit 2
SSPC2
Bit 1
SSPC1
Bit 0
SSPC0
COR3
COR2
COR1
Encoding
0
0
0
Not used.
0
0
1
COR1 changed.
0
1
0
COR2 changed.
0
1
1
COR1 and COR2 changed.
1
0
0
COR3 changed.
1
0
1
COR3 and COR1 changed.
1
1
0
COR3 and COR2 changed.
1
1
1
COR1, COR2, and COR3 changed.
Bit
Description
7:6
Must be
0
.
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