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# Pic12c508

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#### Rajppd

##### New Member
Hi, How different is PIC12C508 from PIC12F508? I am new to PICs. Pls advice me.

#### Number17

##### New Member
I'm pretty sure the PIC12C508 can only be programmed once, while PIC12F508 is flash.

#### Nigel Goodwin

##### Super Moderator
I'm pretty sure the PIC12C508 can only be programmed once, while PIC12F508 is flash.

Correct, although there are UV eraseable versions of the 12C508, but VERY expensive.

I have some.

Damn i feel old.

#### Number17

##### New Member
How long does it take to erase a chip with UV light? Does it erase as fast as the computer erases a flash one?

#### Nigel Goodwin

##### Super Moderator
How long does it take to erase a chip with UV light? Does it erase as fast as the computer erases a flash one?

Nothing like! - 20 minutes or so under a UV eraser lamp.

If you were wanting to do development you really need a good number of UV ones for any kind of speed, and place them back in the eraser as you move to the next.

I've got ONE 12C508JW, it was about £12-15 - something like more than 10 times a normal one.

You shouldn't even be considering it now the 12F508 is available.

#### Mr RB

Yep I've got 2, nice little gold beasties they are and I paid about $20 AUD each for them? My home made eraser with 4W germicidal tube erases them in 2 to 3 minutes (PIC at 10mm from tube). I used to use one in program/testing while the other was being erased. I hated working with 12C series. That 2 level stack, and you can only use function calls in SOME of the program memory blocks! And really short of ram too if I remember right... #### birdman0_o ##### Active Member Yep I've got 2, nice little gold beasties they are and I paid about$20 AUD each for them? My home made eraser with 4W germicidal tube erases them in 2 to 3 minutes (PIC at 10mm from tube). I used to use one in program/testing while the other was being erased.

I hated working with 12C series. That 2 level stack, and you can only use function calls in SOME of the program memory blocks! And really short of ram too if I remember right...

Sounds darn awfull
I was born at the right time

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#### Nigel Goodwin

##### Super Moderator
Sounds darn awfull
I was born at the right time

That's why the 16C84 was so popular, it was the ONLY EEPROM based PIC there was, all the rest were OTP.

#### Chippie

##### Member
Nothing like! - 20 minutes or so under a UV eraser lamp.

...and if they are anything like UV erasable eproms, over exposing will turn them into Read Only....

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