I remember reading somewhere in avr libc docs to do e.g. this:
PCIFR = _BV (some_bit)
loop_until_bit_is_clear (PCIFR, some_bit);
This may be a bad example becuase of the odd write-one-to-clear
semantics. That isn't the point here, I don't remember which
registers this advice applied to. And I can't find it now.
The only thing I could find in the datasheet that related to this was
in section 13.2.4 of ATMega328P datasheet, where it says that you
have to wait a cycle after assigning an output pin value before
reading it back in.
Are there other cases where loop_until_* or a nop is required?
Thanks,
Britton
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