Low frequency PWM generation method for a microprocessor-based c

Details Low frequency PWM generation method for a microprocessor-based c Low frequency PWM generation method for a microprocessor-based c

1998-02-09

2000-10-24

Grant, William

Data processing: generic control systems or specific application

Generic control system, apparatus or process

Sequential or selective

700 1, 713502, G05B 1101

Patent

active

061380474

ABSTRACT:
An improved method of operation for a microprocessor-based controller wherein a frequency limited counter can be used to generate low frequency PWM signals having on and/or off periods that exceed the period of the microprocessor's free-running counter. The improved method of operation involves comparing the requested PWM period (on or off) to the counter period, and determining if multiple counter periods are required to generate the requested PWM period. If multiple counter periods are required, the controller configures the PWM output port to maintain its current logic level until the requested period has timed out. In this way, the microprocessor can accurately generate the requested low frequency PWM output signals without requiring any hardware modifications.

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