Posts Tagged ‘extract avr mcu heximal’

PostHeaderIcon Extract AVR MCU Firmware

Extract AVR MCU Firmware from flash and eeprom memory, disable the security fuse bit of AVR microcontroller and unlock microprocessor program memory, read the firmware out from AVR MCU;

Extract AVR MCU Firmware from flash and eeprom memory, disable the security fuse bit of AVR microcontroller and unlock microprocessor program memory, read the firmware out from it;

Extract AVR MCU Firmware from flash and eeprom memory, disable the security fuse bit of AVR microcontroller and unlock microprocessor program memory, read the firmware out from it;

The first experiment was performed on the Microchip PIC12C509 microcontroller with UV EPROM. The chip was programmed with all 0’s and exposed to UV light for different periods of time. Then it was read in the test board at different power supply voltages to estimate the threshold level for each EPROM cell in the memory array.

We assumed that the reference voltage is tied to the power supply line and therefore the threshold level of the transistor VTH = K VDD, where K is usually close to 0.5. The fact that we do not measure the exact threshold voltage of the transistor does not affect our results because we are interested in the relative erase timing between the memory and the security fuse.