CONTENTS PAGE
INTRODUCTION? 1
DC MOTORS? 1
THE 83C51FA? 1
SETTING UP THE PCA? 2
HARDWARE REQUIREMENTS? 3
DRIVER CIRCUIT? 4
NOISE CONSIDERATIONS? 4
OPEN LOOP AND CLOSED LOOP
SYSTEMS? 5
FEEDBACK? 5
SOFTWARE/CPU OVERHEAD? 7
ELECTRICAL BRAKING? 8
STEPPING A DC MOTOR? 9
TIME DELAYS? 9
CONCLUSION? 11
APPENDIX? A-1
This application note shows how an 83C51FA can be
used to efficiently control DC motors with minimum
hardware requirements. It also discusses software implementation
and presents helpful techniques as well as
sample code needed to realize precision control of a
motor.
There is also a brief overview of the new features of the
83C51FA. This new feature is called the Programmable
Counter Array (PCA) and is capable of delivering
Pulse Width Modulated signals (PWM) through designated
I/O pins.