CD1284 Datasheet, PDF (134/176 Pages) Intel Corporation – IEEE 1284-Compatible Parallel Interface Controller with Two High-Speed Asynchronous Serial Ports

CD1284 — IEEE 1284-Compatible Parallel Interface Controller
7.6.3
Special Character Register 3
Register Name: SCHR3
Register Description: Special Character Register 3
Access: Read/Write
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Special Character 3
Bit 2
8-Bit Hex Address: 1C
Default Value: 00
Bit 1
Bit 0
7.6.4
Special Character Register 4
Register Name: SCHR4
Register Description: Special Character Register 4
Access: Read/Write
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Special Character 4
Bit 2
8-Bit Hex Address: 1D
Default Value: 00
Bit 1
Bit 0
7.6.5
Received Character Range Detection
If enabled (by bit 7 of COR3), the CD1284 checks received characters to see if they fall within a
range of values. SCRL and SCRH set the range and the checking occurs inclusive of the values
programmed into these registers. If a received character is determined to be within the range, a
special character detect exception service request is posted. When set to ‘111’, RDSR[6:4] indicate
a range detect. Note that this range checking is performed in addition to the normal special
character detection on SCHR4–SCHR1.
7.6.6
Special Character Range — High
Register Name: SCRH
Register Description: Special Character Range, high
Access: Read/Write
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Character Range — high
Bit 2
SCRH sets the upper inclusive value for range detection.
7.6.7
Special Character Range — Low
8-Bit Hex Address: 23
Default Value: 00
Bit 1
Bit 0
Register Name: SCRL
Register Description: Special Character Range, low
Access: Read/Write
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Character Range — low
Bit 2
SCRL sets the lower inclusive value for range detection.
8-Bit Hex Address: 22
Default Value: 00
Bit 1
Bit 0
134
Datasheet