View source for Generating PWM with PIC16F877A ← Generating PWM with PIC16F877A

[[Category:Starter PIC16F877]]
In this tutorial we will see how to generate the PWM signals using PIC16F877A.<br> 
[[File:0_LPC1768_PWM.gif]]

=Prerequisites=
Please check [[PIC16F877A PWM|this tutorial]] for detailed explanation on PIC16F877A PWM module.<br>
<br><br>

=PIC16F877A PWM Module=
PIC16F877A microcontroller has two independent CCP(Capture/Compare/PWM) modules, named as CCP1 and CCP2. Each CCP module has two 8-bit resistors(CCPxH,CCPxL) that can be use as:
*16 bit Capture Register
*16 bit Compare Register
*10-bit PWM Register.

In this tutorial we will be discussing only the PWM part of CCP. PIC has 2PWM module with a resolution of 10-bits.<br>
Below tables shows the PWM module of PIC.

{| class="table table-striped table-hover table-condensed table-bordered"
|-class="info"
!PWM Channel || Port Pin ||  Control Register || Duty Cycle Register || Period Register
|-
|PWM1|| PC.2  || CCP1CON || CCPR1L || PR2
|-
|PWM2|| PC.1  || CCP2CON || CCPR2L || PR2
|}<br>

=Code1=
Below is the example to vary the brightness of the LED using PWM.<br>
<html>
<script src="https://gist.github.com/SaheblalBagwan/10d4363c076b7a5b136a16da9f766b32.js"></script>
</html>

=Code2=
Progarm to generate the PWM signals of 25% & 75% duty cycle.
<html>
<script src="https://gist.github.com/SaheblalBagwan/5a49f953cd43f136fe954777c4373128.js"></script>
</html>

Ouptut measured using CRO:
[[FILE:PwmOutput.png]]