STM32H745ZI Power On Reset Problem issue,

[JYoon.2]

i use CubeMX, CubeProgrammer, ST-LinkV3set, and IAR

i made my own Board, modifiy en.MB1363-H745ZIQ-C01_Schematic

ST-Link can recognize Device when Boot0 to High and PowerOnReset.

when Boot0 to Low and PowerOnReset can not recognize Device.

What can i debug??

Add

Boot0 to High and PowerOnReset State, I can download

Error Massage

"no MCU device found session aborted"

[Uwe Bonnes]

Is some programm loaded? Does the programm remap JTAG/SWD pins? Try connect under reset!

[JYoon.2]

swd : i didnt use remap function,

st-link : using Connect during reset

Boot1 to High before powerOnReset , i can program.. and it is located 0x800 0000

[JYoon.2]

Boot0 to High before powerOnReset , i can program.. and it is located 0x800 0000

==miss typing

[T J]

the 4.7uF cap or 2x 2.2uF caps , on Vcap pins seems fairly critical.

do you have a reset chip ?

use a scope and check at high frequency, trigger on the power rail dip, slowly lower the trigger level, if its 0.5V below VCC that is your issue...

more bypass caps...

[JYoon.2]

thanks for reply, i will check them.

[JYoon.2]

i checked Vcap pin, it is 1.2V level

and use scope it looks fine...

[Tesla DeLorean]

Try doing some simple stuff in main(), without calling SystemConfig(), as I recall part should run at 64 MHz by default.

Toggle some GPIO, output via a USART.

Check HSE_VALUE matches board design.

If it doesn't get to main(), uncheck "run to main()" or equivalent setting, start stepping in Reset_Handler.

Have HardFault_Handler() and Error_Handler() report actionable data.