SCD1284 INTEL [Intel Corporation], SCD1284 Datasheet - Page 120

• Manufacturer Part Number: SCD1284
• Description: IEEE 1284-Compatible Parallel Interface Controller with Two High-Speed Asynchronous Serial Ports
• Manufacturer: INTEL [Intel Corporation]

CD1284 — IEEE 1284-Compatible Parallel Interface Controller
7.3.1.3
120
Bit 7
0
Bit
5:4
3:1
Bit
7:6
7
6
0
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.
Description
This bit must always be ‘0’.
This bit must always be ‘1’.
These bits must always be ‘0’.
These three bits are encoded as:
This bit must always be ‘0’.
Description
Must be ‘0’.
Bit 6
0
COR3
0
0
0
0
1
1
1
1
Send SC
Bit 5
COR2
1
1
0
0
1
1
0
0
Bit 4
0
COR1
Bit 3
0
0
1
0
1
0
1
0
1
Not used.
COR1 changed.
COR2 changed.
COR1 and COR2 changed.
COR3 changed.
COR3 and COR1 changed.
COR3 and COR2 changed.
COR1, COR2, and COR3 changed.
SSPC2
Bit 2
SSPC1
Encoding
Bit 1
Datasheet
SSPC0
Bit 0