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What could be the reason if power turns on or off causes MCU to fail?

Latest Updated:07/04/2003

Question:

(CPU)   Turning the power supply on or off often causes MCU operation to fail. What could be the cause?

Answer:

One possible reason is that register Z is not set. Since the initial value of register Z is undefined, it needs to be set after reset is deasserted. In addition, the initial values of some other registers and flags are undefined, so they need to be checked. (#105008)
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