On 8/3/05, Dmitriy Kiryashov <vze27bym@verizon.net> wrote:
> I suspect that is input only type of pin.
> You still can try manipulate it by switching
> pull ups on and off.

  Nice !

Vasile


> 
> 
> 
> laura capaldi wrote:
> >
> > I've been struggling to figure out why I can set GP1, GP2, GP4 and GP5 without trouble but I can't get GP3 to set. Set meaning I can't get it to go high and turn on an LED. I'm using a 12F675. I suspect it has something to do with my config bits because MCLR is on GP3. Here's the simple program I wrote. I'm hoping someone can help me spot my bug. Thanks.
> >
> > ; test1
> >  list      p=12F675
> >  #include <p12f675.inc>
> >  __CONFIG  _CP_OFF & _WDT_OFF & _BODEN_ON & _PWRTE_ON & _INTRC_OSC_NOCLKOUT & _MCLRE_OFF & _CPD_OFF
> > #define Bank0  0x00
> > #define Bank1  0x80
> >  cblock 0x20
> >  ncount
> >  mcount
> >  ocount
> >  endc
> >  ORG     0x000
> >  nop
> >  goto    Init
> >  ORG 0x004
> >  return
> > Init
> >  banksel Bank1
> >  movwf   OSCCAL
> >  movlw B'00000001' ; set direction so all pins except GP0 are output pins
> >  movwf TRISIO  ; so GP0 is input pin
> >  movlw b'00010001'
> >  movwf ANSEL  ; make GP0 (AN0) be analog input and Fosc/8 for A/D conversion clock
> >  banksel Bank0
> >  movlw b'111'
> >  movwf CMCON  ; disable comparator
> >  movlw b'00000001' ;
> >  movwf ADCON0   ; Select AN0 as a2d channel, Left justified & enables A/D
> >  NOP      ; Give 4 uS delay before starting A/D
> >  NOP
> >  NOP
> >  NOP
> >  bsf ADCON0,GO   ; Start A/D
> > Main
> >  call NOon
> >  call delay
> >  call GP1on
> >  call delay
> >  call NOon
> >  call delay
> >  call GP2on
> >  call delay
> >  call NOon
> >  call delay
> >  call GP3on
> >  call delay
> >  call NOon
> >  call delay
> >  call GP4on
> >  call delay
> >  call NOon
> >  call delay
> >  call GP5on
> >  call delay
> >  goto Main
> > NOon
> >  movlw b'00000000'
> >  movwf GPIO
> >  return
> >
> > GP1on
> >  movlw b'00000010'
> >  movwf GPIO
> >  return
> > GP2on
> >  movlw b'00000100'
> >  movwf GPIO
> >  return
> > GP3on
> >  movlw b'00001000'
> >  movwf GPIO
> >  return
> > GP4on
> >  movlw b'00010000'
> >  movwf GPIO
> >  return
> > GP5on
> >  movlw b'00100000'
> >  movwf GPIO
> >  return
> > delay
> >  movlw 0x10
> >  movwf mcount
> > loadn
> >  movlw 0xFF
> >  movwf ncount
> > loado
> >  movlw 0xFF
> >  movwf ocount
> > repeat
> >  decfsz ocount,f
> >  goto repeat
> >  decfsz ncount,f
> >  goto loado
> >  decfsz mcount,f
> >  goto loadn
> >  return
> >
> >  END
> >
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