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CONTENTS PAGEINTRODUCTION 1DC MOTORS 1THE 83C51FA 1SETTING UP THE PCA 2HARDWARE REQUIREMENTS 3DRIVER CIRCUIT 4NOISE CONSIDERATIONS 4OPEN LOOP AND CLOSED LOOPSYSTEMS 5FEEDBACK 5SOFTWARE/CPU OVERHEAD 7ELECTRICAL BRAKING 8STEPPING A DC MOTOR 9TIME DELAYS 9CONCLUSION 11APPENDIX A-1This application note shows how an 83C51FA can beused to efficiently control DC motors with minimumhardware requirements. It also discusses software implementationand presents helpful techniques as well assample code needed to realize precision control of amotor.There is also a brief overview of the new features of the83C51FA. This new feature is called the ProgrammableCounter Array (PCA) and is capable of deliveringPulse Width Modulated signals (PWM) through designatedI/O pins.
