On 01/12/2011 21:40, Georg-Johann Lay wrote:
> It's not unusual because:
>
> * It's not unusual to write down SFRs as violatile memory like
> (*((volatile unsigned int*) 0x1234)) or as a cast to a composite
> that reflects the SFRs bit(field)s.
>
> * It's not unusual that microcontrollers can access specific parts
> of memory -- in particular I/O -- with special instructions.
Great. Now I'm going to be hearing Tom Jones in my head for the rest of the
day! :)
(ObTopic: Andrew H's definition of volatile is completely right AIUI and the
case reported by Peter B is definitely a very bad bug. Volatile operations
are externally visible and must be executed in source-code order.)
cheers,
DaveK
