Hi,

I think you forgot to turn off the A/D converter ....
Remember that after reset all analog/digital multiplexed pins are set to
analog mode.

Regards,

Fabio

> I'm getting started with the 12F675, moving up from
> the 16F84, and am having a little trouble.  I don't
> know if it's my code or MPLAB, but what I'm trying to
> do is pretty simple and I spent a few hours on it with
> little to show.
>
> Basically I'm trying to get comfortable with the F675
> and its I/O.  I started with a 1 kHz square wave
> generator I wrote for the F84 and ported that to the
> F675.  When that didn't work (in MPLAB), I pared it
> all the way down to just setting one of the GPIO bits,
> and couldn't even get that done.  So, here's the code
> I ended up with.  I'm using MPLAB IDE version
> 6.10.0.0.  What is the problem?
> -----
>   LIST P=12F675, R=DEC
>   errorlevel 0,-305
>   INCLUDE "\program files\mplab
> ide\mchip_tools\P12F675.inc"
>
> ;  Registers
>
>  __CONFIG _CP_OFF & _WDT_OFF & _XT_OSC & _PWRTE_ON
>
>   PAGE
> ;  Mainline
>
>   org 0
>   clrf   GPIO                   ;  Init GPIO
>   movlw  B'00000111'            ;  Turn off CM
>   movwf  CMCON                  ;
>   bsf    STATUS, RP0            ;  Goto Bank 1 to set
> Port Direction
>   movlw  B'00001100'            ;  Set GPIO<3:2> as
> input and
>   movwf  TRISIO                 ;  GPIO<5:4,1:0> as
> outputs
>   bcf    STATUS, RP0            ;  Go back to Bank 0
>   movlw  B'00000001'
>   movwf  GPIO                   ;  Set bit 0 of GPIO
>
> loop
>   goto  loop
>
>   end

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