I've connected the two Vss pins together and the two Vdd pins. Still got
the same problem. Something weird though....

When I touch the top of the 16C74JW the LED lights up. The LED is active
low. ie: connected between RB0 and +5V with 220ohm R. Should this happen??
It seems strange to me.

Thanks

Stewart Pye

At 11:17 PM 8/06/99 -0400, you wrote:
>Stewart:
>
>You realy must connect those pins together and to supply.  I accidentally
left
>one of the VS's off on a '73 once, and the A/D didn't work right at all.  A
>cursory check with a meter saw that pin at ground, or so one would think on a
>quick glance.  Turns out that a few tens of mV will whack the A/D.  Connect
>them through and to supply, with bypass.
>
>Try a small hello world by killing the watchdog, interrupts, and all
>unnecessary calls.  Start small and work up!  You might just read TMR0 and
>stuff it onto port C for the fun of it.. Scope should go nuts.  Don't forget
>that the portA is set for analog function by default.  Ref ADCON0/1.  And
that
>RA4 is an open collector all the time.  If you were looking for excitement on
>one of these RA pins, you could have the wool over your eyes.
>
>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
>