In a message dated 98-03-12 13:18:02 EST, you write:

You certainly can do this on a PIC!  At the start of the interupt routine you
simply check the INTCON reg to see what generated the interupt and jump
accordingly.

Then Motorolla parts have different kinds of interupts, thus the different
vectors.  One vector for an IRQ and another for the NMI another for SWI etc.
It still won't tell you what device generated the interupt, You have to resort
to polling the devices inside the interupt routine.

Dave Duley

<<
 I don't think you can do this on a PIC because there is only one
 interrupt vector. You could do this on a Motorola (for example), but
 even then, I wouldn't recomend it. Getting interrupted from an interrupt
 can cause all kinds of problems (stack, endless loops, memory
 corruption, etc). Recursive interrupt functions are a nightmare.

 Having said that, in your application, maybe you could start the
 interrupt the way you suggest, then load your timer, and poll the timer
 status flag to see if it has expired.

 Brad Stevenson, CET
 The DPL Group - Telecom Techniques
 506-635-1055 or 1-800-561-8880
 http://www.dpl.ca >>