Fuse (and Lock) Bits are a type of low level programming and security feature on embedded devices. Most popularly known in Atmel AVR devices, they can be likened to a secure Bios on a computer. They can also be found in MSP430, PIC, and other microcontrollers. Care needs to be taken when working with programming Fuse Bits, as they can render a device useless. MANY are One Time Programmable.

Fuse (and Lock) Bits are a type of low level programming and security feature on embedded devices. Most popularly known in Atmel AVR devices, they can be likened to a secure Bios on a computer. They can also be found in MSP430, PIC, and other microcontrollers. Care needs to be taken when working with programming Fuse Bits, as they can render a device useless. MANY are One Time Programmable.

A common security move chosen by consumer technology manufacturers is to use fuse bits to prevent downgrading firmware. Microsoft's Xbox line, Sony's Playstation line, BluRay players, and HDMI capable devices are known to do this. Many Printer and Ink Manufacturers use eeproms that have these features, much to the detriment of their consumers.

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