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SCD1284 Datasheet(PDF) 53 Page - Intel Corporation

Part # SCD1284
Description  IEEE 1284-Compatible Parallel Interface Controller with Two High-Speed Asynchronous Serial Ports
PDF  176 Pages
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Manufacturer  INTEL [Intel Corporation]
Direct Link  http://www.intel.com
Logo INTEL - Intel Corporation

SCD1284 Datasheet(HTML) 53 Page - Intel Corporation

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IEEE 1284-Compatible Parallel Interface Controller — CD1284
Datasheet
53
Figure 8. FIFO Timer Processing
TIMER = 0
?
FROM OTHER
BACKGROUND PROCESSING
BACKGROUND SCANNING
DETECTS NEW CHARACTER
ARRIVED
PUT CHARACTER IN FIFO
RELOAD TIMER
RESUME BACKGROUND
SCANNING LOOP
FIFO EMPTY
?
NO NEW DATA
TIMEOUT
ENABLED
?
NO NEW DATA
INTERNAL FLAG
ARMED
?
CLEAR NONEWDATA
INTERNAL FLAG
POST RECEIVE EXCEPTION
SERVICE REQUEST
RESUME BACKGROUND
SCANNING LOOP
Y
Y
Y
Y
N
N
N
N
POST RECEIVE ‘GOOD DATA’
SERVICE REQUEST



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