资料介绍
Pulse Width Modulation (PWM) modules are
commonly used in many applications to provide an
inexpensive control output method that uses only a few
external components. The PWM signal can be used
directly as a digital signal to drive switches in a power
conversion circuit. Or, it can be filtered using external
components to produce an averaged 'analog' signal
with an output level that is proportional to the duty
cycle. Either way, the duty cycle of the PWM signal
determines the level of system output while the
frequency remains fixed. The typical PICmicro
®
PWM
module (CCP/ECCP) is ideally designed to support
these common types of applications providing high
duty cycle resolution for a given fixed frequency. AN1050
A Technique to Increase the Frequency Resolution of
PICmicro MCU PWM Modules
Author: Lucio Di Jasio FIGURE 1: TYPICAL PICMICRO
Microchip Technology Inc. MICROCONTROLLER
CCP/ECCP MODULE BLOCK
DIAGRAM
INTRODUCTION
Duty Cycle Registers CCPxCON<5:4>
Pulse Width Modulation (PWM) modules are
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