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On the two wire interface it is important to remember to put pull-up resistors on both the SCL and the SDA according to the I²C spec, since these pins are never driven high. On SPI, this seems like an obvious statement at surface level, but it’s a very common mistake, and we want to make sure that all MISO pins are connected to MISO pins. This is also true with the master out slave in or MOSI pins, they should only be connected to MOSI. So in other words, tie all the MOSI pins in your system together, and tie all the MISO pins together. Because the two signal names are very similar, make sure that you’re not swapping the signal names as well as their actual functionality.
PTM Published on: 2006-08-24
