check ram base address is corect.

check output pin is not designated as a special function pin from reset.

connect ALL power supply pinz.

DON'T activate security bitz, they won't U.V. erase !

regards,
Graham.


Stewart Pye wrote:
>
> Hi...
>
> I'm testing a project that uses a 16C74A. I've used the 16F84 quite a bit
> but this is my first try using the 16C74 with a HS osc at 16Mhz.
>
> Problem:
> I cant even get an led to flash. I know the code is correct. I set the osc
> to HS.
>
> Question:
> Are the two VDD and VSS pins connected internally???
> I got 12ohms between the 2 Vss pins but several Mohms between the Vdd pins.
> Is this correct??
> Should I connect these pins externally???
> Is there something else that could be causing the problem?
>
> Any help would be much appreciated. (the frustration's building)
>
> Thanks,
> Stewart Pye

--
Steam engines may be out of fashion, but when you consider that an
internal combustion engine would require recovery of waste heat by
transfer just before top dead centre then fashion becomes rather
redundant, USE STRATIFIED HEAT EXCHANGERS ! and external combustion.

You heard it first from: Graham Daniel, managing director of Electronic
Product Enhancements.
Phone NZ 04 387 4347, Fax NZ 04 3874348, Cellular NZ 021 954 196.