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The program cannot be programmed using ULINK. After pressing the DEBUG key, the voltage of the reset pin of the microcontroller changes from 3.3V to 2.8V. I do not know why.

MCU
December 17, 2020 by Gabriel 1684

Related circuit diagrams.

Can you analyze the logic of this schematic diagram? In the end, why can't I burn the program and perform simulation? How can the reset pin voltage of the MCU change from 3.3V to 2.8V?

T1X{3X5~[JR9PK0{73UKFFP.png

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Savannah Posted on December 17, 2020

It feels different

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Luis Posted on December 17, 2020

Do you have analog ground and digital ground in your circuit?

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  • Gabriel

    Gabriel Posted on December 17, 2020

    This program upgrades and burns the circuit, and the reset circuit shares the ground. The analog ground is in another circuit.

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Luis Posted on December 17, 2020

If this is the case, will there be a voltage drop between the two power sources.

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Carlos Posted on December 17, 2020

If there is no problem with the circuit, the voltage will be reduced when the power supply is insufficient, which means that the load exceeds the capacity of the power supply.

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