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STM32F4 to STM32F7 compatibility

Question asked by peregrinus on Oct 28, 2016
Latest reply on Oct 28, 2016 by FTITI.Walid
Hi All. 
Looking at the STM32F7 Series main page I read: "STM32F7 series is pin-to-pin compatible with the STM32F4 series".

Now, I would like to find a device pin to pin compatible with the STM32F407VG I am currently using. I checked several devices but none of them seems to be pin to pin compatible. I wonder whether there is a rule to understand the device compatibility between the two series.

The code seems not to be the key, for instance STM32F46x looks incompatible with STM32F76x.