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SCD1284 Datasheet(PDF) 120 Page - Intel Corporation

Part # SCD1284
Description  IEEE 1284-Compatible Parallel Interface Controller with Two High-Speed Asynchronous Serial Ports
PDF  176 Pages
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Manufacturer  INTEL [Intel Corporation]
Direct Link  http://www.intel.com
Logo INTEL - Intel Corporation

SCD1284 Datasheet(HTML) 120 Page - Intel Corporation

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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 7Bit 6Bit 5Bit 4Bit 3
Bit 2Bit 1
Bit 0
0
0
Send SC
0
0
SSPC2
SSPC1
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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