參數(shù)資料
型號(hào): 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(gè)高速異步串行端口
文件頁數(shù): 117/176頁
文件大?。?/td> 2255K
代理商: CD1284
IEEE 1284-Compatible Parallel Interface Controller
CD1284
Datasheet
117
7.2.6
Transmit Data Register
The transmit data register is the port for the host to write to the transmit FIFO. When a channel is
being serviced for a transmit service request, the host can write up to 12 characters to this register.
The transmit data register should only be written during the context of a transmit-service
acknowledge. A write of data to this location at any other time yields unpredictable results.
7.2.7
Transmit Interrupt Vector Register
The value in this register is placed on the data bus, DB[7:0], when SVCACKT* is activated in
response to an active SVCREQT*. See
Section 7.4.6 on page 128
for more details on the LIVR.
0
1
1
Group 3: Received good data service request.
1
0
0
Invalid.
l
l
l
1
1
0
1
1
1
Group 3: Received exception data service request.
Register Name: TDR
Register Description: Transmit Data
Access: Write only
Bit 7
8-Bit Hex Address: 63
Default Value: 00
Bit 6
Bit 5
Bit 4
Transmit Character
Bit 3
Bit 2
Bit 1
Bit 0
IT2
IT1
IT0
Description
Register Name: TIVR
Register Description: Transmit Interrupt Vector
Access: Read only
Bit 7
Bit 6
X
X
8-Bit Hex Address: 42
Default Value: 00
Bit 5
X
Bit 4
X
Bit 3
X
Bit 2
IT2
Bit 1
IT1
Bit 0
IT0
IT2
IT1
IT0
Description
0
0
0
No transmit interrupt active.
0
0
1
Invalid.
0
1
0
Group 2: Transmit data service request.
1
1
1
Invalid.
l
l
l
1
1
1
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