SCD1284 datasheet(134/176 Pages) INTEL

134 / 176 page

CD1284 — IEEE 1284-Compatible Parallel Interface Controller

134

Datasheet

7.6.3

Special Character Register 3

7.6.4

Special Character Register 4

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

SCRH sets the upper inclusive value for range detection.

7.6.7

Special Character Range — Low

SCRL sets the lower inclusive value for range detection.

Access: Read/Write

8-Bit Hex Address: 1C

Default Value: 00

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Special Character 3

Access: Read/Write

8-Bit Hex Address: 1D

Default Value: 00

Bit 7Bit 6Bit 5Bit 4Bit 3

Bit 2Bit 1

Bit 0

Special Character 4

Access: Read/Write

8-Bit Hex Address: 23

Default Value: 00

Bit 7Bit 6Bit 5

Bit 4

Bit 3Bit 2Bit 1Bit 0

Character Range — high

Access: Read/Write

8-Bit Hex Address: 22

Default Value: 00

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Character Range — low

SCD1284 Datasheet(PDF) 134 Page - Intel Corporation

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