AVR-Chat

> Remember that 0<<xx does NOTHING. :-)


Right, thanks, but that isn't my latency problem.

It may be that GCC is saving "the world" before it enters my code..
@$!@$@#!$@#%$@%$
That would seem to be roughly the right order of magnitude.. 32 pushes..

In ASM, I'd have reserved a couple of registers specifically for the
ISRs, and another one for SREG, so getting in and out would be like
this:

ISR:
     in STEMP,SREG

     (ISR code, rarely needing to push anything at all..)

     out SREG,STEMP
     reti