ASM - Problem at first step!

[cncmachineguy]

Compiles and works fine in MPLAB SIM. PORTC bits 4,5,2,3 all get set. Post your Protous file and we can have a look for you.

[Megahertz]

16f676.zip

My DSN file attached.

[mister_e]

I don't use ISIS/Proteus, but as per your configuration fuses, you must tie you MCLR pin to Vdd... make sure it is done.

Another thing... It's nogt a bad Idea to finish your program with an endless loop, so the LED will stay on.

I bet this will work, if you haven't tied you MCLR pin to Vdd

    LIST P=16F676
    #include <p16F676.inc>
    __CONFIG   _CP_OFF & _CPD_OFF & _BODEN_OFF & _MCLRE_OFF & _WDT_OFF & _PWRTE_ON & _INTRC_OSC_NOCLKOUT
    
    CLRF    PORTC
    BSF    STATUS,RP0
    CLRF    TRISC
    CLRF    ANSEL
    BCF    STATUS,RP0
    BSF    PORTC,4
    BSF    PORTC,5
    BSF    PORTC,2
    BSF    PORTC,3
    goto $
    END

And from what I do remember of my venture with ISIS, you need to specify the osc speed... set it to 4MHz and try the above without specifying the configuration word value. If it's still not working, tie your MCLR pin to Vdd. Ought to work ... or throw away ISIS

[cncmachineguy]

Steve is correct You need to either turn off MCLR or tie it high. As a side note, you have some hardware issues that will make you think the program doesn't work. It has to do with tying all the LED's together then through 1 resistor to ground. Also I think you have to edit the properties for the GND symble and assign it the name "GND" to make it be ground.

I am Very new to ISIS, but that has caused me trouble in the past.

Sorry bout taking so long to reply, had trouble getting on the forum yesterday.

[mister_e]

..., had trouble getting on the forum yesterday.

Me too, and I guess everybody has too. Bah, it happen once in a while. No problem, nobody will die of it

[Megahertz]

Thanks for the help. I tied MCLR to VDD & named the ground terminal 'GND'. Worked fine. I almost started having suicidal thoughts becoz of this. Thanks again.

[mister_e]

I almost started having suicidal thoughts becoz of this.

Don't do that again, no SIM worth that much attention