AVR-Chat

Ok, things are becoming more interesting.  Below is my update to
avr@atmel.com, on my debugwire frustrations:


Additional info.

In the pic that I sent, you can see that the system failed to clear
ZH, even though it was straightline code, "clr ZH"

This has been absolutely consistent since it started happening,
through reboots, powerdown of target and debugger, etc.  I also
noticed that the debugger was failing to properly load up the stack
pointer, which is simply

ldi	TEMP,low(RAMEND)	; $04FF
out	SPL,TEMP	;Init stackpointer
ldi	TEMP,high(RAMEND);
out	SPH,TEMP	;

At the end of this, SP was $04XX where XX was whatever happened to be
in ZL when we came in.

Today I noticed the common thread.  BOTH of these points had
breakpoints set. Even though I wasn't USING the breakpoints, (I was
single-stepping), that was causing the problem.

I may not have read ALL the documentation, but as far as I'm aware,
setting a breakpoint is not supposed to also cause the debugger to
ignore the instruction at the breakpoint.

Please advise.