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[HW] Direct connect between Ports of STM32s?

Question asked by s.gd on Jul 13, 2011
Latest reply on Jul 13, 2011 by Andrew Neil
If two STM32 devices are wired together in a system, is it necessary to place fairly small series resistors between the port connection to limit the current in case a port or ports somehow starts driving current to the other processor and possibly degrades or destroys it? This is not a big problem to do except that the series resistance somewhat reduces the maximum SPI baudrate between the STM32 parts, e.g., can go 18Mbps w/o resistors but only 9Mbps works with the resistors on the SPI signals.

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