SC68C752B datasheet(32/49 Pages) PHILIPS

32 / 49 page

SC68C752B_3

Product data sheet

Rev. 03 — 29 November 2005

32 of 49

Philips Semiconductors

SC68C752B

5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 64-byte FIFOs

Programmer’s guide

The base set of registers that is used during high-speed data transfer have a

straightforward access method. The extended function registers require special access

bits to be decoded along with the address lines. The following guide will help with

programming these registers. Note that the descriptions below are for individual register

access. Some streamlining through interleaving can be obtained when programming all

the registers.

Table 24:

Command

Actions

Set baud rate to VALUE1, VALUE2

read LCR (03h), save in temp

set LCR (03h) to 80h

set DLL (00h) to VALUE1

set DLM (01h) to VALUE2

set LCR (03h) to temp

Set Xoff1, Xon1 to VALUE1, VALUE2

read LCR (03h), save in temp

set LCR (03h) to BFh

set Xoff1 (06h) to VALUE1

set Xon1 (04h) to VALUE2

set LCR (03h) to temp

Set Xoff2, Xon2 to VALUE1, VALUE2

read LCR (03h), save in temp

set LCR (03h) to BFh

set Xoff2 (07h) to VALUE1

set Xon2 (05h) to VALUE2

set LCR (03h) to temp

Set software ﬂow control mode to VALUE

read LCR (03h), save in temp

set LCR (03h) to BFh

set EFR (02h) to VALUE

set LCR (03h) to temp

Set ﬂow control threshold to VALUE

read LCR (03h), save in temp1

set LCR (03h) to BFh

read EFR (02h), save in temp2

set EFR (02h) to 10h + temp2

set LCR (03h) to 00h

read MCR (04h), save in temp3

set MCR (04h) to 40h + temp3

set TCR (06h) to VALUE

set MCR (04h) to temp3

set LCR (03h) to BFh

set EFR (02h) to temp2

set LCR (03h) to temp1

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