Hi all,

Sorry to ask the very basics, but I'm running into a little trouble :(

I've connected up a PIC 16C74 on a breadboard, and am feeding in a
4Mhz signal onto pin 13 (the Clk in pin) from a signal generator.

I'm applying 5v to pins 11 & 32, with 0v on 12 & 31

As far as I can tell at the moment, that should mean a program I put
onto the pic should run?

So I wrote a small program (very small :) to turn port D into an output
and blat bits out of it, incrementing. .  such as this

org 0
        goto start


org 50

start
        movlw B'00000000'
        movwf TRISD             ; Setup port D for all outputs

        clrf PORTD              ; Blank it

        bsf STATUS, RP0

main_loop
        addlw 1                 ; add 1 to W
        movwf PORTD             ; copy W to port D
        goto main_loop

end

This appears to toggle between 8 & 9 for some reason under MPSIM
Am I missing something?
Does anyone have any sample 16c74 code out there I could peruse :)

Cheers,

Glyn D.

--

Glyn D / http://www.cs.man.ac.uk/~daviess / Computer Science 3rd year

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