> Van: Markus Falkenau <Tacciness@AOL.COM>
> Aan: PICLIST@MITVMA.MIT.EDU
> Onderwerp: Problems with MPLAB
> Datum: donderdag 2 december 1999 23:20

Hello Markus,

> How can I clear the TRIS(A..E) registers of a 16F877 in MPLAB v4.12.00 ?
I
> already tried it with:
> "clrf    TRISA" and with
> "movlw   h'0'    movwf   TRISA".
> These opcodes work perfectly with all kind of variables but not with the
> TRIS(A...E) registers.

The TRIS(A .. E) registers are not in the first FSR-bank.  So, you will
have to select the right FSR-bank, and than address the TRIS register.  The
FSR-bank select bits are in the Status-register (RP0 & RP1).

If you do a "CLRF TRISA" , the result will (probably) be "CLRF PORTA"
because PORTA is in the first FSR-Bank (Bank #0).

Regards,
  Rudy Wieser