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STM32F427II (UBGA176) can not program

Question asked by Corso on Nov 6, 2013
Latest reply on Nov 7, 2013 by Clive One
Hi Everyone,

I have just finished a project with the MCU STM32F427II but I can not program it. I use the ST-LINK v2 programmer with a 4 wire (SWD).

I have check all the connection and I found that the pin (bypass_reg) is floatting in my design not at the Vss. Could it cause my problem?

In the past, I have use 144 pin LQFP, 100 pin and 64 pin I have never use this pin before.

Thank you,