Re: [avr-gcc-list] SREG save?

[David Kelly]

On Dec 14, 2004, at 7:09 AM, Mattias Svensson wrote:

> As i recall:
> INTERRUPT() runs with global interrupts enabled.
> SIGNAL() runs with global interrupts disabled.

Am away from my .pdf's at the moment but I'm quite sure Mattias is 
correct. That the usage is opposite of Codevision.

What I'd research is how the AVR prepares itself for an IRQ and then 
recovers with RTI. I would expect the I bit is disabled automatically 
and restored on RTI. Many CPUs stack the status register and many other 
things automatically on IRQ but "high performance RISC" usually do not 
as it takes about the same amount of time to do it in code and if one 
is in a big hurry its not always necessary. But having said that I 
recall avr-gcc 3.4.1 stacks 0x3f in SIGNAL().

Have found "avr-objdump -S" to be extremely useful.

--
David Kelly N4HHE, address@hidden
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Whom computers would destroy, they must first drive mad.