Pic16f870

[skimask]

lol.... Not a damn thing. Not 1 pin goes high.
I have a few of these chips ordered at different times so the likely hood of all of them being bad is not very likely.
Edited:
I took out my "DEFINE OSC 8" and no Porta.6 goes high but is not blinking. So I guess it's still "nothing happens"..................

Kinda rules out bad port settings eh?


What are you using for an oscillator? A crystal? A resonator? External clock input?

Got a pull up on MCLR?

[plyrathrt]

Internal, packaged in to the chip.

You only need to pull up the MCLR for Programming... Also keep in mind, this is on a full development board (Mikroelectronica EasyPIC 5) and not just placed in a breadboard with ICSP.

[skimask]

Internal, packaged in to the chip.
You only need to pull up the MCLR for Programming... Also keep in mind, this is on a full development board (Mikroelectronica EasyPIC 5) and not just placed in a breadboard with ICSP.

Ok, here's the next question....and it's going to be a tough one, I mean hard...You may have to study quite awhile to answer this one...

Which internal clock would that be on the PIC16F870?
(Ref: Pic16F870 datasheet, DS30569B-page 89)

[plyrathrt]

I don't see anything about a software selectable internal oscillator. I am guessing that is why you said "you may have to study very hard". Is that correct?

Even with that it should still turn a pin high that I designate for a button press right?

[skimask]

I don't see anything about a software selectable internal oscillator. I am guessing that is why you said "you may have to study very hard". Is that correct?

Even with that it should still turn a pin high that I designate for a button press right?

Not without some sort of oscillator driving the chip you won't...The PIC16F870 doesn't have an internal oscillator...Therefore, your chip won't run anything.

Did you see the 4 oscillator/clock options you have with the PIC16F870?

[plyrathrt]

Yes I did, however for my project I must have a internal oscillator due to size constraints... Ok, so basicly I am the idiot and I should take a hammer to my head instead of the chip... I don't know why I assumed it had a internal oscillator other than the fact that I have never used mid-range MCU's. Only 16pin and smaller PIC's.

Know of a 28pin PIC with a accurate internal oscillator off the top of your head?

[skimask]

Yes I did, however for my project I must have a internal oscillator due to size constraints... Ok, so basicly I am the idiot and I should take a hammer to my head instead of the chip... I don't know why I assumed it had a internal oscillator other than the fact that I have never used mid-range MCU's. Only 16pin and smaller PIC's.

Know of a 28pin PIC with a accurate internal oscillator off the top of your head?

Parametric search at Microchip.com
13 hits on a 16F PIC in a 28 pin package with an internal oscillator block...
My personal favorite for a 28 pin PIC at the moment wouldn't be a 16F though. It would be a PIC18F2685 (96K of code space) or a PIC18F2550 (USB included)...
All sorts of options here...

Another thing...just to verify it all, get it to at least work, you can use the R/C oscillator. Just hang a resistor and a capacitor off the OSC1 pin and see what happens.
Sure, it's not accurate, but it'll at least verify that your hardware is good.