AVR-Chat

ATMEGA8 simulation in:
AVR Studio	4, 8, 0, 310
Platform	AVR Simulator	Build	1, 0, 0, 12
Part		ATMEGA8	Build	65

Operating System
Major		5
Minor		1
PlatformID	2
Build		2600
Service Pack 1

Problem #1:

Everything's fine initting the machine, up to Idle.
I set a BP at Idle, and run it to there.
Then I put a BP in at Panic, and take off the one at Idle.
Notice that all the routines are commented out. 
So only ISR's could even be running.
After 6513uS (the loop takes 1uS) I'm at Panic, with SP at 045F
Apparently it loops in this code 6512 times just fine, then fails the same test.
Now, the question is, with SPL=5F, and SPH=04, WHY am I at Panic?

With the routines enabled, I run the machine just fine, till I hit Panic.

Idle:
	;rcall	Timed_Smack	;Resets watchdog, if it's time to do so.
	wdr
	;rcall	Start_Step	;If possible, make a step, speed based on fu
	;rcall	Printhead_Latch	;Latches printhead, and starts burning the A half
	;rcall	Send_Pixel_Line	;
	;rcall	Fake_Pixel_Lines; Simulates reception via SPI, except a line at a time.

	;Stack check
	in		TEMP,SPL
	cpi		TEMP,$5F
	brne	PANIC
	in		TEMP,SPH
	cpi		TEMP,$04
	breq	Idle

Panic:
	rjmp	Panic



Problem #2:

I am getting INT1 even though INT1 is disabled.
It does appear to respect GIE, but at more or less random intervals, I find myself in the INT1 ISR, with INT1 cleared in GICR.

INT0 does not seem to have this problem.