Write protecting your chip….is there any way back from that?

I have an issue. I programmed several PIC 16F788 and 10F222s and tried to use them again, but I couldn't. After several hours of frustration and trying various approaches, it occured to me I may have write protected the chips. The bit was set, after all.

Is there any way to come back from a write protect, or is the garbage the ultimate destiny for my chips?

Catwell

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Sunnyzhuo over 15 years ago

I want to konw which programing method you have used? if you used the ICD2 tool to ICSP your chip. you can use a H-Voltage programmer to programming again after modified the configuration bits, this may restore it,but I can't make sure. Generally, if you set the configuration bit. you can't modify it again. but you can have a try. you'd better read the relative details of the chip programming in the datasheet .
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MicrochipRTCfr over 15 years ago in reply to Sunnyzhuo

Hi,

Whatever configuration bits you program in any PIC, there is always a possibility to erase the FLASH memory.
Several points you must ensure to be able to erase the chip :

1/ Some PICs ( like the PIC10F222) cannot be erased at low voltage (i.e. < 4.5V) if the code protect bits have been activated.
A "Bulk erase" need to be performed.
To check this, download the Programming specification of your PIC10F222.

2/ All standard programmers from Microchip (Pickit3, ICD3, Real-Ice, PM3) do perform Bulk erase

You can get 24/7 free online support from Microchip here : http://support.microchip.com

You can also get professional training on Microchip products and technologies in many countries in the Regional Training Centers (RTC) : http://www.microchip.com/RTC

Hope this helps

Regards
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Sunnyzhuo over 15 years ago in reply to MicrochipRTCfr

It's very kind of you to teaching us about the knowledge. it's also very helpful! thank you!
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Sunnyzhuo over 15 years ago in reply to MicrochipRTCfr

It's very kind of you to teaching us about the knowledge. it's also very helpful! thank you!
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