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): 121/176頁
文件大?。?/td> 2255K
代理商: CD1284
IEEE 1284-Compatible Parallel Interface Controller
CD1284
Datasheet
121
7.3.1.4
Format 4
Channel Control Command
This command activates or deactivates the serial transmitter and/or receiver of the selected
channel, based on the values in bits 3 through 0. This command is issued when a channel is being
started for the first time. Once a channel is in use, it can be started and stopped using this
command. It is more efficient however, to use the appropriate SRER bit in the IER. Multiple
control commands can be issued at the same time; for example, both the transmitter and receiver
can be enabled by simultaneously setting both the XMT EN and RCV EN bits.
Issuing an enable/disable command does not affect any register programming of the selected
channel. It does however, affect the state of transmit flow-control. Issuing a disable or enable
command to a channel whose transmitter has been flow-controlled by a remote (see the TxIBE bit
in COR2), restarts transmission and clears the TxFloff bit (CCSR[2]). This ability is provided so
that the host can override remote-generated flow control.
5
Must be
1
.
4:3
Must be
0
.
2:0
These bits are encoded as:
Bit 7
0
Bit 6
0
Bit 5
0
Bit 4
Chan Ctl
Bit 3
XMT EN
Bit 2
Bit 1
RCV EN
Bit 0
XMT DIS
RCV DIS
Bit
Description
SSPC2
SSPC1
SSPC0
Encoding
0
0
0
Not used.
0
0
1
Send special character 1.
0
1
0
Send special character 2.
0
1
1
Send special character 3.
1
0
0
Send special character 4.
1
0
1
Not used.
1
1
0
1
1
1
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