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CD1865 Datasheet(PDF) 42 Page - Intel Corporation |
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CD1865 Datasheet(HTML) 42 Page - Intel Corporation |
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42 / 150 page  CD1865 — Intelligent Eight-Channel Communications Controller 42 Datasheet 5.5.5 Comparison of Interrupt and Polled Code Sequences Figure 12 and Figure 13 show the code sequences for polled and interrupt service request methods. Figure 12. Polled Code Sequence READ SERVICE REQUEST STATUS FROM SRSR RECEIVE REQUEST PENDING? TRANSMIT REQUEST PENDING? MODEM SIGNAL CHANGE REQUEST PENDING? N N READ REQUESTING CHANNEL NUMBER READ NUMBER OF BYTES FROM RDCR SET UP HOST’S BUFFER POINTERS SET LOOP COUNTER = RDCR READ RDR WRITE DATA TO POINTER LOCATION INCREMENT POINTER DECREMENT LOOP COUNTER IF LOOP COUNTER = 0 SAVE POINTER EXIT ISR READ RRAR TO ACKNOWLEDGE, GET STATUS VECTOR GOOD DATA ? Y Y Y TO TRANSMIT ROUTINE TO MODEM ROUTINE N HANDLE ‘BAD’ DATA Y N |
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