>> but I'm
>> still confused as to whether a BSF PORTA,0 followed by a CLRF PORTA,F
>> is a reliable way of making an output pulse on Port A's low bit that
>> stays high for exactly one instruction (4 clock cycles).
>
> Huh?  It will go low due to the BSF, then all the other port A bits will
> also go low one instruction later.

Sorry, I somehow read the BSF as BCF.  Yes, this should produce a one
cycle high pulse, assuming the pin was low before the BSF.


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