I managed to burn my first PIC - question!

[whiz115]

ooops i did it!

what i tried is out of curiosity to decouple a 78L05 with 1uF polyester capacitor from the middle pin of the regulator to the (+) and the PIC said goodbye! i can see the code inside it but i can't run my PIC or program it again.

the problem is that i don't understand what i did!! must something with the capacitive reactance? or MCLR 10K resistor touched the one end of the capacitor and something happend?

 

[blueroomelectronics]

What sort of programmer was it? What PIC?

 

[whiz115]

the programmer is JDM and i have no problems with it.
the PIC was an 628A

 

[Pommie]

If you can read the code in the chip then it is very unlikely that it is damaged.

Mike.

 

[whiz115]

i tried another 628 and it gets programed just fine....

what's the case here? i don't understand...

 

[Nigel Goodwin]

i tried another 628 and it gets programed just fine....

what's the case here? i don't understand...

If you programmed the chip as internal oscillator, then you probably can't access it any more with a JDM?, which is really a pretty poor programmer.

 

[whiz115]

i'm always programing it using internal oscillator... the only time i didn't it was when i did the Tetris game with the PIC.

Nigel it is possible the PIC still works? if yes why the program inside it doesn't run anymore?

 

[Nigel Goodwin]

i'm always programing it using internal oscillator... the only time i didn't it was when i did the Tetris game with the PIC.

If the PIC oscillator is running, then you can't enter programming mode - so this means some programmers can't access a PIC once you've set the internal oscillator, particularly if you set MLCR as an I/O pin.

Nigel it is possible the PIC still works? if yes why the program inside it doesn't run anymore?

It's almost certainly fine, it's VERY difficult to damage a PIC.

 

[blueroomelectronics]

I've thrown out a perfectly good 16F88 once because I programmed a hex file for a differnt PIC into it (It overwrote the config bits)
Turns as other users here found you could fool the programmer by connecting a good 16F88 and then dropping in the screwy 16F88 and erasing.
But as Nigel said, tough little beasties. I've even seen super hot PICs recover (+ & - reversed) still function.

 

[Nigel Goodwin]

I've even seen super hot PICs recover (+ & - reversed) still function.

I've got a 16F628 that still functions fine, and it's got my finger print burnt in the top of it!

 

[blueroomelectronics]

I've got a 16F628 that still functions fine, and it's got my finger print burnt in the top of it!

You should put it on eBay