Weird problem with pic

[David21]

My pic seems to stop working whenever I move my hand next to it (not touching the pic). I programmed an LED to blinks and it stopped blinking whenever my hand is close to the pic. It seems like i have this problem when i'm using pic+max232.

Some kind of capacitance problem??

[PCM programmer]

See this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=13001

[David21]

thank you. Ur so helpful. I thought I was the only one with the problem

now I can get close and personal with my pic

[David21]

Why does moving my hand close to the pic cause it to reset?

[PCM programmer]

1. Add the NOLVP fuse (assuming your PIC supports that fuse).

2. Make sure you have a pullup resistor on the MCLR pin.
Use a 10K resistor. (If you use CCS ICD, then use 47K).

3. Check all power and ground connections to the PIC.

[Guest]

why does adding NOLVP fix the problem?

[Ttelmah]

When 'LVP' is selected, the chip is in a mode, where _any_ signal activity seen on the PGM pin, can put it into programming mode.
If you are using LVP, and have this fuse enabled, then ensure that you have a resistor pulling the PGM pin to 0v, or erratic behaviour may result.
The chips _default_ to this mode (this is because otherwise boards that require this feature, cannot switch to this mode, once the chip is soldered in place).
You should always disable this mode (NOLVP), _unless_ you specifically want the feature, and have wired your board to support it.

Best Wishes

[Guest]

thanks. I've learned something new