Q: What happens when an exposed Vcc pin of a target system (with an AVRISP connected to it) accidentally brushes against a +12V DC battery terminal?
A: The AT90S8535 (inside the AVRISP) blows its lid off - literally. The pictures below say it all. (Happened during Robocon days at VESIT)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiibBBjT_yaXaDT7Ukzyn5a3r_f5SOMp-ZCpGWS1yKrs0zTqAgYAB3bP1E4eK-S0yQ8cxApHwMJWFTgIp9p_CFKiYT_3lmj39iOp8HmkiyqIF33cR6_xYbjt9lUM-fXCXwHrnJcj43x6Ow/s400/Blown+apart.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixDma-D2Z6DEdp-FUuTHFHoNtcukk6kWnzkRrL0WXag89L2YpUBmNUK3gabeFQpeLYMEhYmdcOTkbMAYjJ6a_2zFfS99lVMzremC7bBsgAy4IvrAXY-xY7HGxhGwv3Gkp9NmlfnSz1fTk/s400/15x.jpg)
A: The AT90S8535 (inside the AVRISP) blows its lid off - literally. The pictures below say it all. (Happened during Robocon days at VESIT)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiibBBjT_yaXaDT7Ukzyn5a3r_f5SOMp-ZCpGWS1yKrs0zTqAgYAB3bP1E4eK-S0yQ8cxApHwMJWFTgIp9p_CFKiYT_3lmj39iOp8HmkiyqIF33cR6_xYbjt9lUM-fXCXwHrnJcj43x6Ow/s400/Blown+apart.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixDma-D2Z6DEdp-FUuTHFHoNtcukk6kWnzkRrL0WXag89L2YpUBmNUK3gabeFQpeLYMEhYmdcOTkbMAYjJ6a_2zFfS99lVMzremC7bBsgAy4IvrAXY-xY7HGxhGwv3Gkp9NmlfnSz1fTk/s400/15x.jpg)
For a photograph of a silicon chip inside an AVR (A90S1200) with its various regions marked, look here.
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