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[MarkEngineer]

Watchdog timer is off, I do use an Assembly interrupt routine to create a time base using TIMER2. AT 16 MHZ I can make a 1/100th second interrupt.
I do not think I am overflowing the stack (or maybe I am?) as there is one GOSUB to one subroutine at a time in a Mainloop which contains nothing but a RETURN statement. If I move the subroutine further up in the code, it works fine. It seems like once it is further down enough, no subroutine will RETURN back.
The PIC has 64K of code space, I should be nowhere near that. I wonder if I am crossing some 2K boundary or something like that or if the interrupt routine
screws up a bank select register. I use MOVFF in the assembly interrupt routine to save W, STATUS, BSR, PCLATH upon entering, and restore upon exiting then RETFIE.

[towlerg]

JOOQ I looked at 18F46K22 datasheet. You can read the stack pointer, STKPTR. Just before your call test the stack pointer. At least you know whether your about to overflow. And of course make sure you have STVREN on.

George

[rsocor01]

Mark, most people here, including myself, won't be able to help you with assembly language. Only a few here have gone to the dark side and know assembly .

You said that the RETURN command in your subroutine doesn't seem to be working. It is very important to know the line where the program isn't working anymore. What I ussually do is to write a line of code to turn on an LED for 5 seconds. Then, I move that line toward the end of the program until the LED doesn't turn on anymore. Put this line before entering the subroutine and then inside the subroutine and let us know what you find out.