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Reset bus power

Question asked by powell.dane on Feb 15, 2013
Latest reply on Feb 16, 2013 by powell.dane
I use my STM32F0 to communicate with an SPI slave device, which is powered by the 3V bus on the STM32F0.

My problem is that when I reset the STM32F0, the bus power is not interrupted, which leaves the SPI device in an unrecoverable state. I need to drop power to the device momentarily in order to re-initialize it.

Is there a way to forcibly disable the 3V power of the STM32F0 momentarily? If not, can you suggest an alternative solution? I tried powering the device from an I/O pin but it behaved erratically- it looked like the I/O pin was only outputting 500 mV.