Hi ! When the boot mode activated in STM32F427VIT6 ( BOOT0 pin to HIGH level) , the pin PE13 in strong HIGH state

[OLe.812]

When the boot mode activated in STM32F427VIT6 ( BOOT0 pin to HIGH level) , the pin PE13 in strong HIGH state (really 3.3V). Why? The PE13 pin goes to LOW level just if i begin download firmware by UART bootloader

[waclawek.jan]

> ( BOOT0 pin to HIGH level) , the pin PE13 in strong HIGH state

What is connected to PE13?

Also, is it going to HIGH immediately after NRST ends? (observe with an oscilloscope).

JW

[OLe.812]

To PE13 just coonected 10k resistor to GND and thats it. Yes, PE13 still in HIGH after reset, look the attached picture from scope . Thanks for you reply:)

[waclawek.jan]

NRST is active low, at that moment all pins are Hi-Z by the processor.

So why is PE13 actually higher during NRST low, if it's just a 10k resistor to GND?

The 2.4V after reset ends is suspicious, too, though.

JW

[OLe.812]

Yes. its higher during NRST low... and it state of PE13 will be switch on MOSFET with current 1A in my circuit (if i connect this pin)