Syntax:
#option volatile `bit`
This option ensure port setting are glitch-free.
Introduction:
#option volatile bit where bit is an IO bit, like PORTB.0 appended.
This will cause the compiler to set the bit without any glitches when copying a value from another variable, but will increase code size slightly.
Example:
'Set chip model
#chip 16f877a
'Example command
#option volatile portb.0
dir portb.0 out
do forever
portb.0 = !portb.0
loop