PWM, or pulse width modulation, is a technique for producing square wave outputs of a specified duty cycle, or ratio of ON time to total period.The ON time, as measured in either seconds or clock counts (C ON), is the time that the output is active. Two reasons: Firstly, the loop() function does have some overhead, and secondly the code that you write takes time to execute. This is why the hardware PWM timer is valuable - it generates the pulses without much software intervention. I used the code below and it resulted in 125 kHz and 1.6 MHz (measured with a CRO, not simulation).
Sep 16, 2006 · Pulse width modulation (PWM) is a powerful technique for controlling analog circuits with a processor's digital outputs. PWM is employed in a wide variety of applications, ranging from measurement and communications to power control and conversion. Mar 15, 2017 · In this tutorial, we will learn How to generate PWM signals using PIC PIC16F877A. Our PIC MCU has a special module called Compare Capture module (CCP) which can be used to generate PWM signals. Here, we will generate a PWM of 5 kHz with a variable duty cycle from 0% to 100%.