SCD1284 datasheet(115/176 Pages) INTEL

115 / 176 page

IEEE 1284-Compatible Parallel Interface Controller — CD1284

Datasheet

115

7.2.3

Parallel Interrupt Vector Register

The value in this register is placed on the data bus, DB[7:0], when SVCACKP* is activated in

response to an active SVCREQP*. See Section 7.4.6 on page 128 for more details on the LIVR.

7.2.4

Receive Data/Status Registers

The Receive Data/Status register serves two purposes. During a serial receive-service acknowledge

for good data, the RDSR provides access to the receive FIFO. The number of characters available

in the FIFO is indicated by the RDCR, and is described in Section 7.5. Any number of characters,

up to the value in the RDCR, can be read from the FIFO. All internal FIFO pointers are updated by

the on-chip processor.

During a serial receive exception service acknowledge, the RDSR provides both the received

character and the status that caused the exception condition. By definition, a receive exception

service request has only one character available (multiple receive exceptions produce multiple

service requests). The first read from the RDSR provides the exception status, and the second read

Access: Read only

8-Bit Hex Address: 40

Default Value: 00

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

XXX

IT2

IT1

IT0

IT2

IT1

IT0

Description

No parallel interrupt source is active.

Group 1: Modem signal change service request.

010

Invalid.

lll

011

The parallel port state machine requests service.

The parallel port data pipeline requests service.

110

Both the parallel port state machine and the parallel port data

pipeline request service.

111

Invalid.

Access: Read only

8-Bit Hex Address: 62

Default Value: 00

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Received Character

Access: Read only

8-Bit Hex Address: 62

Default Value: 00

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Timeout

SC Det2

SC Det1

SC Det0

Break

SCD1284 Datasheet(PDF) 115 Page - Intel Corporation

SCD1284 Datasheet(HTML) 115 Page - Intel Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL