At 07:18 PM 2/18/2012, IVP wrote:

>eg the old way was
>
>movlw 0x55
>tris portb
>
>is now deprecated to
>
>movlw 0x55
>movwf trisb

One huge difference, though, is this: the 'tris' instruction works=20
properly no matter how the RP0 / RP1 bits are set.

In other words, your second example (above) will NOT work if the RAM=20
page bits are not correctly set.  The 'tris' instruction works all=20
the time, every time.

Same for the 'option' instruction - it works properly regardless of=20
the RAM page bit settings.

For those reasons, my legacy code still uses those instructions.  The=20
'option' instruction saves several cycles, which was useful in some=20
ISR routines.

dwayne

--=20
Dwayne Reid   <dwayner@planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax
www.trinity-electronics.com
Custom Electronics Design and Manufacturing

--=20
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