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electromechy1, Make sure you change the ADCON register to make the AD inputs Digital I/O's instead of the analog inputs. Regards, Jim > hi guys, > just wtitten 1st prog as per data sheet,builds ok, problem is when i > run it in simulator (mplab), trisio loading ok but gpio won't load > value from w reg....i know i am doing something wrong...but can't find > sample progs for 12f675...anyway heres my prog > > cmcon equ 19h > gpio equ 05h >status equ 03h > trisio equ 85h > > bcf status,5 ;goto bank 0 > clrf gpio ;clear gen purp in/out port > movlw 07h ;load w reg > movwf cmcon ;set pin 0,1,2 to digital i/o > bsf status,5 ;goto bank 1 > movlw 8h ;make pins 0,1,2,4,5 outputs > movwf trisio ;pin 3 can only be input > bcf status,5 ;back to bank 0 > movlw 3fh ;load w reg > movwf gpio ;switch on pins > end ;end program > > regards > >shaun > > > ------------------------ Yahoo! Groups Sponsor > ---------------------~--> Free shipping on all inkjet cartridge & > refill kit orders to US & Canada. Low prices up to 80% off. We have > your brand: HP, Epson, Lexmark & more. > http://www.c1tracking.com/l.asp?cidU10 > http://us.click.yahoo.com/GHXcIA/n.WGAA/ySSFAA/dN_tlB/TM > ---------------------------------~-> > > to unsubscribe, go to http://www.yahoogroups.com and follow the > instructions > > ">http://docs.yahoo.com/info/terms/ |
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Re: help!!!!! with pic 12f675
Started by ●August 1, 2003
Reply by ●August 1, 20032003-08-01
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hi guys, just wtitten 1st prog as per data sheet,builds ok, problem is when i run it in simulator (mplab), trisio loading ok but gpio won't load value from w reg....i know i am doing something wrong...but can't find sample progs for 12f675...anyway heres my prog cmcon equ 19h gpio equ 05h status equ 03h trisio equ 85h bcf status,5 ;goto bank 0 clrf gpio ;clear gen purp in/out port movlw 07h ;load w reg movwf cmcon ;set pin 0,1,2 to digital i/o bsf status,5 ;goto bank 1 movlw 8h ;make pins 0,1,2,4,5 outputs movwf trisio ;pin 3 can only be input bcf status,5 ;back to bank 0 movlw 3fh ;load w reg movwf gpio ;switch on pins end ;end program regards shaun |
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Reply by ●August 1, 20032003-08-01
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hi jim, thanx for reply, adcon register defaults to zero, i.e, off regards shaun | |||
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Reply by ●August 1, 20032003-08-01
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Why are you clearing gpio prior to setting up the port? Note 08h is not 8h, is it? This works for me on a 12F629 & 675 bcf status,5 movlw 0x07 movwf cmcon bsf status,5 movlw 0x08 movwf trisio bcf status,5 clrf gpio Also, I think the 675 needs to have the ansel setup for analog, cleared for digital I/O. Regards, John. --- In , "shaunundergrad" <electromechy1@a...> wrote: > hi guys, > just wtitten 1st prog as per data sheet,builds ok, problem is when i > run it in simulator (mplab), trisio loading ok but gpio won't load > value from w reg....i know i am doing something wrong...but can't > find sample progs for 12f675...anyway heres my prog > > cmcon equ 19h > gpio equ 05h > status equ 03h > trisio equ 85h > > bcf status,5 ;goto bank 0 > clrf gpio ;clear gen purp in/out port > movlw 07h ;load w reg > movwf cmcon ;set pin 0,1,2 to digital i/o > bsf status,5 ;goto bank 1 > movlw 8h ;make pins 0,1,2,4,5 outputs > movwf trisio ;pin 3 can only be input > bcf status,5 ;back to bank 0 > movlw 3fh ;load w reg > movwf gpio ;switch on pins > end ;end program > > regards > > shaun |
Reply by ●August 1, 20032003-08-01
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cheers john, yes your right about the ansel having to be cleared, have it working now (on simulation anyway), i was clearing gpio because this was given as example in data sheet, don't forget i'm a newbie. one thing i haven't sussed yet...does the internal oscillator configured to come when powered up....and how do you know when you've blown a chip?? regards shaun | |||
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Reply by ●August 3, 20032003-08-03
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I'm not sure I understand you question, if you configure the internal
oscillator to run then it runs when the chip powers up. b) I know I've cooked a chip usually after I've done something stupid like put 15vdc on it instead of 5. Else you can fry a port or an I/O, but they seem pretty hearty. Regards, John. --- In , electromechy1@a... wrote: > cheers john, > yes your right about the ansel having to be cleared, have it working now (on > simulation anyway), i was clearing gpio because this was given as example in > data sheet, don't forget i'm a newbie. one thing i haven't sussed yet...does > the internal oscillator configured to come when powered up....and how do you > know when you've blown a chip?? > > regards > > shaun |
Reply by ●October 2, 20032003-10-02
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You have to include config word __CONFIG _CP_OFF & _INTRC_OSC_NOCLKOUT & _PWRTE_ON & _WDT_OFF & _MCLRE_OFF Just cut and paste other wise it won't work. Burt --- In , "Paul James E." <jamesp@i...> wrote: > > electromechy1, > > Make sure you change the ADCON register to make the AD inputs Digital > I/O's instead of the analog inputs. > > Regards, > > Jim > > > hi guys, > > just wtitten 1st prog as per data sheet,builds ok, problem is when i > > run it in simulator (mplab), trisio loading ok but gpio won't load > > value from w reg....i know i am doing something wrong...but can't find > > sample progs for 12f675...anyway heres my prog > > > > cmcon equ 19h > > gpio equ 05h > >status equ 03h > > trisio equ 85h > > > > bcf status,5 ;goto bank 0 > > clrf gpio ;clear gen purp in/out port > > movlw 07h ;load w reg > > movwf cmcon ;set pin 0,1,2 to digital i/o > > bsf status,5 ;goto bank 1 > > movlw 8h ;make pins 0,1,2,4,5 outputs > > movwf trisio ;pin 3 can only be input > > bcf status,5 ;back to bank 0 > > movlw 3fh ;load w reg > > movwf gpio ;switch on pins > > end ;end program > > > > regards > > > >shaun > > > > > > > > > > ------------------------ Yahoo! Groups Sponsor > > ---------------------~--> Free shipping on all inkjet cartridge & > > refill kit orders to US & Canada. Low prices up to 80% off. We have > > your brand: HP, Epson, Lexmark & more. > > http://www.c1tracking.com/l.asp?cidU10 > > http://us.click.yahoo.com/GHXcIA/n.WGAA/ySSFAA/dN_tlB/TM > > ------------------------------ ---~-> > > > > to unsubscribe, go to http://www.yahoogroups.com and follow the > > instructions > > > > ">http://docs.yahoo.com/info/terms/ |
