SPBRG = 64 'Set to 4800 bps
-------------double check this...

-------------Are your A/D pins set to analog or digital?

BAUD CON 16390
-------------double check this too...

myroutine:.................
GOSUB SENDATA
...............................
resume
enable

-----------Not good programming practice to jump out of an interrupt routine and hope it comes back into it every time...might not....

if counter=5000 THEN 'just to keep the pic busy to make sure the
toggle portd.0 'Toggle LED connected to this pin.
counter=0 ' interrupts are working.
else
counter=counter+1
endif

--------------Is the LED toggling?