TL16C752B
3.3-V DUAL UART WITH 64-BYTE FIFO
SLLS405A – DECEMBER 1999 – REVISED AUGUST 2000
PRINCIPLES OF OPERATION
TL16C752 programmer’s guide (continued)
Set flow control threshold to VALUE
Read LCR (03), save in temp1
Set LCR (03) to BF
Read EFR (02), save in temp2
Set EFR (02) to 10 + temp2
Set LCR (03) to 00
Read MCR (04), save in temp3
Set MCR (04) to 40 + temp3
Set TCR (06) to VALUE
Set MCR (04) to temp3
Set LCR (03) to BF
Set EFR (02) to temp2
Set LCR (03) to temp1
Set xmt and rcv FIFO thresholds to VALUE
Read LCR (03), save in temp1
Set LCR (03) to BF
Read EFR (02), save in temp2
Set EFR (02) to 10 + temp2
Set LCR (03) to 00
Read MCR (04), save in temp3
Set MCR (04) to 40 + temp3
Set TLR (07) to VALUE
Set MCR (04) to temp3
Set LCR (03) to BF
Set EFR (02) to temp2
Set LCR (03) to temp1
Read FIFORdy register
Read MCR (04), save in temp1
Set temp2 = temp1 × EF; (x sign here means bit-AND)
Set MCR (04) = 04 + temp2
Read FRR (07), save in temp2
Pass temp2 back to host
Set MCR (04) to temp1
Set prescaler value to divide-by-one
Read LCR (03), save in temp1
Set LCR (03) to BF
Read EFR (02), save in temp2
Set EFR (02) to 10 + temp2
Set LCR (03) to 00
Read MCR (04), save in temp3
Set MCR (04) to temp3 × 7F; (× sign here means bit-AND)
Set LCR (03) to BF
Set EFR (02) to temp2
Set LCR (03) to temp1
Set prescaler value to divide-by-four
Read LCR (03), save in temp1
Set LCR (03) to BF
Read EFR (02), save in temp2
Set EFR (02) to 10 + temp2
Set LCR (03) to 00
Read MCR (04), save in temp3
Set MCR (04) to temp3 + 80
Set LCR (03) to BF
Set EFR (02) to temp2
Set LCR (03) to temp1
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