Rupert Swarbrick wrote 2013-01-05 16:54:
> Hi,
>
> Can anyone point out what I'm doing wrong with the following (minimal)
> code? I can't seem to convince my 16F1824 to output anything on RA5 (pin
> 2 in the DIP package).
>
> I presume that I've configured the pin to be doing something else, but
> I've pored over the datasheet for ages and can't work out what I've
> missed. Changing the BSF line to "bsf LATA, 4" switches on pin 3 as
> expected. Does anyone have any ideas?
>
> Many thanks,
>
> Rupert
>
>
>
> Assembly file below:
>
> #include <p16f1824.inc>
>
>      ERRORLEVEL -302 ; Banksel warning.
>
>      ; Config options
>      ; FCMEN 0     (Enables internal oscillator on external death,
>      ;              but we're using internal anyway)
>      ; IESO 0      (Two-speed start-up. Not used)
>      ; -CLKOUTEN 1 (Disable CLKOUT and use the pin for IO)
>      ; BOREN 00    (Disable Brown-out reset)
>      ; -CPD 1      (Data code protection)
>      ; -CP 1       (Code protection)
>      ; MCLRE 1     (Use MCLR pin as MCLR: needs a pull-up resistor!)
>      ; -PWRTE 1    (Don't enable the power-up timer)
>      ; WDTE 01     (Watchdog timer software-controlled)
>      ; FOSC 100    (Internal oscillator)
>        __config _CONFIG1,b'00100111101100'
>
>      ; LVP 1       (Enable low-voltage programming)
>      ; -DEBUG 0    (ICSPCLK, ICSPDAT used for debugger)
>      ; '1'         unused
>      ; BORV 1      (Disabled anyway)
>      ; STVREN 1    (Stack under/overflow reset)
>      ; PLLEN 0     (PLL not used)
>      ; '111111'    unused/reserved
>      ; '11'        (Disable write protection)
>        __config _CONFIG2,b'10111011111111'
>
>        UDATA
>
> .RST code h'0000'
>      goto setup
>
> .ISR code h'0004'
>      retfie
>
> setup:
>      banksel ANSELA
>      clrf    ANSELA
>      banksel TRISA
>      clrf    TRISA
>      banksel LATA
>      clrf    LATA
>      goto    main
>
> main:
>      clrwdt
>
>      banksel LATA
>      bsf     LATA, 5
>
>      goto    main
>
>        END
>
>
>

First, use proper CONFIG directivs including the supplied
symbols from the include file. See example in 16F1827TMPO.ASM.

Then, how does the code work in MPSIM ?

Jan-Erik.
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