18F4523 beginner needing help to blink an LED...

[cncmachineguy]

FWIW, Dave your code works in sim, (I don't have that PIC either). 2 things I had to do: comment the configs cuz I was too lazy to go fix the .INC, and I had to tie MCLR high. So question for OP, Do you have MCLR enabled AND tied high? I ask because it's an easy to miss thing.

[mackrackit]

I think the configs are the key here if the OP wants to use the internal OSC.

[cncmachineguy]

Well I must admit, being new to proteus, blinking that LED was like I had done it with my first PIC!! I was thinking about MCLR since I assume when I commented the configs it used the PBP default's.

[mackrackit]

I may have to try a sim again, when I tried it a few years ago... well it just plan was not worth the effort.

The PBP inc configs for this chip are HS on the OSC.

Does your sim have a resonator or something attached?

And you may have hit it about MCLR.

[cncmachineguy]

Well see Dave its like this: I have no idea if there is a resonator or not. I am guessing not. I didn't add 1. my entire circuit is the chip, an led, and a wire to Vcc for MCLR. But there are built in things like automatic tie in to pwr and gnd, so MAYBE? and I didn't even put a resistor in series with the LED. So these things make me go Hmmm. But the LED was blinking at what appears 1 sec rate.

[mackrackit]

Very interesting....

Does the LED burn out after awhile or do you have a place to set VDD to ~3 ?
Yes... I am being a smart _ _ _ now

[cncmachineguy]

in fact I think I could set it to ~3V, but I hooked her right from pin to ground, with uP at 5V. Left it running for 10 mins and still burning bright.

This may be a case of don't fully trust the sim. Sorta like the LED thread where Darrels sim showed the different levels of brightness for different resistor values. but in real life, it works great as you and Dhuston? said.

I don't mind a little smart $$. makes things fun