piclist 1998\10\26\221557a >
Thread: Picn up the Pace Q2
face BY : Heinz Czychun email (remove spam text)

Hi Mike,

       Apparently, on the original 16C84, the Option, and TriState ( data
direction registers ) registers (in Memory Bank 1) were not directly
accessable. The OPTION, and TRISx, instructions had to be used to access
these registers.

       On the 16F84s the second bank of registers are accessable by
setting the rp0 bit in the status register. This allows the Option, and
Trisx registers to be accessed directly. Thus making the TRIS, and OPTION
instructions obsolete. These are still supported by the 'F84 but,
presummably can become unsupported in the future.

       BTW, since you've got PIC'n Up the Pace, Easy PIC'n covers these
subtleties very nicely, in the same format.


At 11:31 AM 10/26/98, Mike Ringenberger wrote:
{Quote hidden}


See also: www.piclist.com/techref/microchip/devices.htm?key=pic
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