Hi WH Tan Thanks for the reply That code is copied straight from the example from Microchip that is included with the compiler. All I added was an if statement and a function call. Can you possibly give me a little more detail with what is wrong with it. I'd be very grateful. (I'm reading as fast as I can too) Phillip Things should be as simple as possible but no simpler Phillip Coiner CTO, GPS Source, Inc. Your source for quality GNSS Networking Solutions and Design Services, Now! -----Original Message----- From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of WH Tan Sent: Thursday, June 29, 2006 10:47 AM To: Microcontroller discussion list - Public. Subject: Re: [PIC] C18 resource remaining metric/test 2006/6/30, Phillip : > #pragma code > #pragma interrupt InterruptHandlerLow > void InterruptHandlerLow () > { Hi Philips, This code is a BIG problem. Someone has pointed out this in recent post! Check the C18 manual again how you should write your low priority ISR. Best regards, -- WH Tan -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist