1. Supply voltage: The average person will think that the chip power supply on the system board is LD output, which is very stable that it will not burn the chip, the chip burning program is generally divided into two ways of burning on the board and burning on the seat, the board burning system board generally has its own MCU power supply voltage range, and the VCC of the debugging interface is generally pulled directly from the chip power supply pin. If the programmer power supply is unstable, exceeding this range, it is easy to cause overvoltage damage to the chip, the chip is generally directly powered by the programmer, if the programmer power supply is unstable, the good yield of the burned chip will be greatly reduced, resulting in damage to the power management chip.
2. Chip encryption: The encryption chip can effectively prevent your production code from being copied, and the chip encryption level is generally 3, OPEN, PROTECTED and KILL, and these protections generally need to be re-powered before they take effect.
OPEN: The chip is unprotected, meaning the software you burn to the chip can be read directly by copycats.
PROTECTED: The chip has readout protection, meaning that no one can read the data on the chip, but the chip can be erased and can be used again after being erased.