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Ancillary circuitry that protects the main circuitry in case of a fault. Examples of faults protected against are: overvoltage, ESD, overheating, and overloading (too high of a current draw). In some cases the protection circuitry is sacrificial, being destroyed or degraded in the act of protecting.
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votes
Protecting AVR flash from reading through ISP?
You may use the lock bits on some ATMega devices and still update your code with the bootloader.
I programmed LB1 and LB2 on a ATMega 328. Then invoked the bootloader, updated the main program - all …