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(gè)高速異步串行端口
文件頁數(shù)： 133/176頁
文件大?。?/td> 2255K
代理商： CD1284
IEEE 1284-Compatible Parallel Interface Controller
—
CD1284
Datasheet
133
7.5.8
Receive Timeout Period Register
The RTPR determines the time period used for the NNDT (no new data timeout) and the
‘
no new
data
’
timeout. The timeout counter is loaded from this register whenever a new character is placed
in
–
or the last character is removed from
–
the receive FIFO. The counter decrements on each tick
of the prescaler counter (PPR). A service request is generated if the count reaches zero and:
Either an NNDT if the FIFO is empty and the NNDT is enabled, or
A Good Data service request is generated if there is data in the FIFO
In either case the timeout period has expired before the FIFO reaches the programmed threshold.
7.6
Special Character Registers
The four special character registers, SCHR1
–
SCHR4, contain the character patterns used for
various character matching and flow-control functions. Each 8-bit character is right justified, that
is, comparison occurs from right to left, and all bits are compared. Any unused bits must be
‘
0
’
.
SCHR1 and SCHR2 serve the additional function of defining the XON and XOFF characters,
respectively, used for in-band flow control.
7.6.1
Special Character Register 1
SCHR1 defines the XON character.
7.6.2
Special Character Register 2
SCHR2 defines the XOFF character.
Register Name: RTPR
Register Description: Receive Timeout Period
Access: Read/Write
Bit 7
Bit 6
8-Bit Hex Address: 21
Default Value: 00
Bit 5
Bit 4
Binary Count Value
Bit 3
Bit 2
Bit 1
Bit 0
Register Name: SCHR1
Register Description: Special Character Register 1
Access: Read/Write
Bit 7
Bit 6
8-Bit Hex Address: 1A
Default Value: 00
Bit 5
Bit 4
Special Character 1
Bit 3
Bit 2
Bit 1
Bit 0
Register Name: SCHR2
Register Description: Special Character Register 2
Access: Read/Write
Bit 7
Bit 6
8-Bit Hex Address: 1B
Default Value: 00
Bit 5
Bit 4
Special Character 2
Bit 3
Bit 2
Bit 1
Bit 0
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