CD1284 Datasheet, PDF (120/176 Pages) Intel Corporation – IEEE 1284-Compatible Parallel Interface Controller with Two High-Speed Asynchronous Serial Ports

CD1284 — IEEE 1284-Compatible Parallel Interface Controller
Bit
7
6
5:4
3:1
0
7.3.1.3
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:
COR3
0
0
0
0
1
1
1
1
COR2
0
0
1
1
0
0
1
1
COR1
0
1
0
1
0
1
0
1
Encoding
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.
This bit must always be ‘0’.
Format 3 — Send Special Character Command
Bit 7
0
Bit 6
0
Bit 5
Send SC
Bit 4
0
Bit 3
0
Bit 2
SSPC2
Bit 1
SSPC1
Bit 0
SSPC0
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
7:6
Must be ‘0’.
120
Datasheet