James Nick Sears wrote:
> First you will need to get the PICs USART enabled and properly
> configured. Check the USART chapter of the datasheet and everything
> is pretty well documented.  This consists of selecting a baud rate,
> enabling receive and send, etc using configuration registers.

For a complete example of this, see my QQQ_UART.ASPIC module at
http://www.embedinc.com/pic.  Note that all the baud rate setup is
calculated in the UART_BAUD macro in STD.INS.ASPIC.  This may still be
useful even if you decide to roll your own routine.

> Then you need to enable interrupts on the PIC (GIE bit) and then
> enable the serial receive interrupt (RCIE).

The interrupt setup and interrupt routine is in the QQQ_INTR.ASPIC template
module.

> To create the ISR at 0x0004 and not have it run when you start you can
> simply start your program like this:
>
>   org 0x0      ; start address = 0000h

Bad idea.  Don't do this.  The proper way is to use relocatable code.  See
my QQQ_STRT.ASPIC and QQQ_INTR.ASPIC modules for complete examples of how to
place the startup and interrupt code at their fixed locations.


*****************************************************************
Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.