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

I am using two SX chips.  One receives serial data and converts it to parallel.  The other takes the parallel data and turns it into a PWM frequency.  My application requires the circuit board to be adjacent to the motor and the SX's need to be supplied from the same power source as the motor (optoisolation will not work).  Right now the circuit is on the breadboard and emf does not seem to be the problem.  I moved it a foot or so away from the motor and same problem.  I think the noise is caused by the motor interfering with the SX's power, clock, or the signal.  The serin SX used an external resonator and each sx has an 10000pf cap accross the power pins.  How do I make those SX's immune to the motor noise.

Thanks

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