The signal on the UART receive pin (RX pin) can be internally routed to an Input Capture module to time the edges of the incoming signal. From that timing the software can set up the UART at the correct baud rate.

dsPIC33F_ABAUD
..............\doc
..............\...\changelog.txt
..............\dsPIC33F_ABAUD.mcp
..............\dsPIC33F_ABAUD.mcs
..............\dsPIC33F_ABAUD.mcw
..............\dsPIC33F_ABAUD.mptags
..............\dsPIC33F_ABAUD.tagsrc
..............\gld
..............\...\p33FJ256MC710A.gld
..............\inc
..............\...\p33FJ256MC710A.h
..............\...\p33FJ256MC710A.inc
..............\obj
..............\...\main.o
..............\out
..............\...\dsPIC33F_ABAUD.cof
..............\...\dsPIC33F_ABAUD.hex
..............\...\dsPIC33F_ABAUD.map
..............\si
..............\..\dsPIC33F_ABAUD.IAB
..............\..\dsPIC33F_ABAUD.IAD
..............\..\dsPIC33F_ABAUD.IMB
..............\..\dsPIC33F_ABAUD.IMD
..............\..\dsPIC33F_ABAUD.PFI
..............\..\dsPIC33F_ABAUD.PO
..............\..\dsPIC33F_ABAUD.PR
..............\..\dsPIC33F_ABAUD.PRI
..............\..\dsPIC33F_ABAUD.PS
..............\..\dsPIC33F_ABAUD.SearchResults
..............\..\dsPIC33F_ABAUD.WK3
..............\src
..............\...\main.c

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