What is PWM in PIC Microcontroller?

What is PWM in PIC Microcontroller?

Generating PWM with PIC Microcontroller using CCP Module PWM is a technique used to generate analog output signal using digital signals. It is commonly used to control average power delivered to a load, motor speed control, generating analog voltage levels and for generating analog waveforms.

Which module is used to generate PWM signal in PIC controller?

The PIC Microcontroller has an inbuilt CCP module and PWM can be easily generated using the inbuilt CCP module. CCP stands for Capture/Compare/PWM.

How many different timer modules can be used with the PWM module?

There are various actuators that work well with a PWM input. PIC18 microcontrollers can have up to 5 CCP modules. Compare enables the counter value of timers to be compared to a 16bit register, and if equal perform an action. Capture can use an external input to copy timer values into a 16-bit register.

Which pins of the PIC18 microcontroller are used for PWM?

PWM Duty Cycle PIC18F4550 controller has an in-built 10-bit PWM module known as the CCP module. The pin CCP1 (RC2) is used for generating PWM signals.

How do you create a PWM signal?

The simplest way to generate a PWM signal is the intersective method, which requires only a sawtooth or a triangle waveform (easily generated using a simple oscillator) and a comparator.

How do you use PWM in PIC16F877A?

PWM in PIC16F877A – Operation Steps

1. Set the PWM period by writing the PR2 register.
2. Set the PWM duty cycle.
3. RC2 pin is used for output configuration.
4. The Prescaler value set in the TMR2 register.
5. We are configuring the CCP module for PWM operation.

Which timer is used for PWM mode?

We will use the simplest timer, TIMER0 for PWM generation. So we have an 8 bit counter counting from 0 to 255 and then resetting to 0 and so on.

How is a PWM signal generated in a PIC microcontroller?

PWM signals can be generated in our PIC Microcontroller by using the CCP (Compare Capture PWM) module. The resolution of our PWM signal is 10-bit, that is for a value of 0 there will be a duty cycle of 0% and for a value of 1024 (2^10) there be a duty cycle of 100%.

How are two CCP modules used in a PIC microcontroller?

PIC 16F877A contains two CCP modules. In the below circuit four switches are provided for controlling the Duty Ratio of PWM generated by two CCP modules of the PIC Microcontroller. The output of the two CCP modules are given to a CRO to observe the changes in pulse width.

How does Pulse Width Modulation on PIC micro work?

Using analogue circuits to generate accurate signals that don’t drift is a difficult task so PWM is very effective and cheap. It works by changing the average voltage level and this is done by generating a constant frequency signal but one where the pulse width is changed (or modulated).

What does mikroC Pro for PIC microcontroller do?

MikroC Pro for PIC Microcontroller provide built-in library for PWM which makes our task very simple. PWM1_Init (constant long frequency) : This function initializes the PWM module with duty ratio 0.