●  Observe the change of AS50XX output signal by turning the knob

         ●  SPI reads the absolute angle value 0-360 ° and the first 6 bits (14-bit) of the binary angle value

         ●  ABI pulse calculation, display knob rotation speed

         ●  Switch PWM output duty ratio

         ●  ABI signal count

         ●  UVW, ABI and multiplexed PWM signals indicate LED display current signal changes