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): 135/176頁
文件大?。?/td> 2255K
代理商: CD1284
IEEE 1284-Compatible Parallel Interface Controller
CD1284
Datasheet
135
7.6.8
Serial Service Request Enable Register
This register enables the conditions that cause the CD1284, to post a service request by the SVRR
and the SVCREQ* output pins, and applies to the serial channels only. Each of the individual
enable bits control one type of service request.
7.6.9
Transmit Baud Rate Period Register
This register holds the baud rate divisor for the transmitter and is used in conjunction with the
TCOR. This provides the clock, which is divided by this value. The time period produced must
equal the value for one bit time of the transmit data.
Register Name: SRER
Register Description: Serial Service Request Enable
Access: Read/Write
Bit 7
Bit 6
MdmChg
0
8-Bit Hex Address: 06
Default Value: 00
Bit 5
0
Bit 4
RxData
Bit 3
0
Bit 2
TxRdy
Bit 1
TxEmpty
Bit 0
NNDT
Bit
Description
7
Modem Change:
This bit enables the Modem Change service request. When this bit is
1
, any selected
modem signal change conditions (as programmed by MCOR1 and MCOR2) cause a modem service request
to be posted.
6:5
These bits must always be
0
.
4
Receive Data Enable:
This bit enables the posting of receive service requests when characters have been
received and either the FIFO reaches the programmed threshold (set by COR3) or the receive timeout period
has expired.
3
This bit must always be
0
.
2:1
Transmitter Ready and Transmitter Empty:
The transmitter can be enabled to post service requests on one
of two conditions: either the FIFO is empty or the Transmitter Shift register is empty.
TxRdy enables the service request on the condition that the FIFO is empty. In this case, there are still two
characters available for transmission before the transmitter underruns (one in the Shift register and one in the
Holding register).
TxEmpty enables the service request on the condition that the Shift register is empty. The transmitter
underruns due to the latency experienced between the time the service request is posted and the time the
host can load the FIFO. Under normal operating conditions, TxEmpty is set and TxRdy reset when there is no
more data to transmit and the host requires notification that the last character was sent before it can disable
the transmitter.
0
No New Data Timeout Enable:
This bit activates the optional exception service request when all data is
removed from the FIFO and no new data has arrived after a preprogrammed delay period set by the value in
the RTPR. The LIVR (or RIVR) indicates a receive exception in the IT2
IT0 vector bits. There is no data
associated with this exception service request. RDSR[7] indicates that the service request is for an NNDT
condition.
Register Name: TBPR
Register Description: Transmit Baud Rate Period
Access: Read/Write
Bit 7
Bit 6
8-Bit Hex Address: 72
Default Value: 41
Bit 5
Bit 4
Binary Divisor Value
Bit 3
Bit 2
Bit 1
Bit 0
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