SCD1284 INTEL [Intel Corporation], SCD1284 Datasheet - Page 134

• 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
7.6.3
7.6.4
7.6.5
7.6.6
7.6.7
134
Register Name: SCHR3
Register Description: Special Character Register 3
Access: Read/Write
Register Name: SCHR4
Register Description: Special Character Register 4
Access: Read/Write
Register Name: SCRH
Register Description: Special Character Range, high
Access: Read/Write
Register Name: SCRL
Register Description: Special Character Range, low
Access: Read/Write
Bit 7
Bit 7
Bit 7
Bit 7
Special Character Register 3
Special Character Register 4
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.
Special Character Range — High
SCRH sets the upper inclusive value for range detection.
Special Character Range — Low
SCRL sets the lower inclusive value for range detection.
Bit 6
Bit 6
Bit 6
Bit 6
Bit 5
Bit 5
Bit 5
Bit 5
Character Range — high
Character Range — low
Bit 4
Bit 4
Bit 4
Bit 4
Special Character 3
Special Character 4
Bit 3
Bit 3
Bit 3
Bit 3
Bit 2
Bit 2
Bit 2
Bit 2
Bit 1
Bit 1
Bit 1
Bit 1
8-Bit Hex Address: 1C
8-Bit Hex Address: 22
8-Bit Hex Address: 1D
8-Bit Hex Address: 23
Default Value: 00
Default Value: 00
Default Value: 00
Default Value: 00
Datasheet
Bit 0
Bit 0
Bit 0
Bit 0