In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

Matthias,
  It is probably detecting a glitch and not really both rising and falling edges.
  It might help to enable the schmitt trigger option for the pins.

  What I would do is to run EACH input into 2 pins. Set one to interrupt on the rising edge, and the other to interrupt on the falling edge.

Bean

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