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

Bean, 
 The distribitor on the engine I have has a hall sensor pusle output of 6 pulses per revolution and has an input that accepts a PWM input that is used to fire the coil to the spark plug. What the OEM ECU does is it take the Hall input pulse then Dwells that then sends out a pulse to the coil so that it will fire the next sparkeplug inline thats how you can change the timming advance on your motor.

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