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STM32F439 and external core supply: NOT WORKING!

Question asked by provincialex on Dec 9, 2014
Latest reply on Dec 9, 2014 by provincialex

BYPASS_REG = High, VCAP = 1.2V (supplied externally), VCC = 1.8...3V

Result: NRST is driven low constantlyby the MCU, nothing works.

The same board works OK when BYPASS_REG = Low and the core's external supply disconnected.

Possible reasons?

And please report if anybody successfully uses external core supply!