Problem with PIC 16F819

[mackrackit]

Sounds like you are getting a handle on it and know what to look for.

BTW... Are you using Proton? Your code does not look like PicBasic.

[newbee]

Mack: Yes i am using Proton, haven't done any change in the circuit yet but seems I might be able to run it on external oscillator by adjusting capacitors on OSC1 & OSC2 ports. Just realized that the Microchip data sheet says 15 pf on each but I have 22 pf, this maybe the problem but why doesn't it run on internal RC, this has to be figured out.

[mackrackit]

You will probably have better luck on the Proton forum.

Here is how I would do it with Pic Basic Pro.

    DEFINE OSC 4           
    OSCCON = %01100000
    @ __config _CONFIG1, _INTRC_IO & _WDT_OFF & _LVP_OFF & _MCLR_OFF &_CP_OFF

[Acetronics2]

Hi, Newbee

Just open your PIC datasheet @ the OSC section, and you will discover the reset pin need a fast rising signal to act correctly ...
you also will find correct circuitry to pass by your supply lazyness ...

in other words, your supply is a bit slow when giving power, and the reset pin must be kept low till the supply voltage is established ...

that's why power supervisors like MC33064P / TC54 VN xx have been created.

Alain

[newbee]

Acetronics thanks, I tried both things grounding the MCLRE pin while powering it up with battery instead of adopter supply. It didn't work, so I think the chip must be faulty. Whether on external oscillator or internal its behavior doesn't change.

[aratti]

(From post 4) .....I had even tried to power it with 9 V battery cells

(From post 9)....so I think the chip must be faulty. Whether on external oscillator or internal its behavior doesn't change.

What did you expect after the 9 volts test ?


Al.