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[HW] Direct connect between Ports of STM32s?

Question asked by 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.