What are the main ways to generate a pwm?

Asked Jan 31 '18 at 01:06

Active Jan 31 '18 at 06:19

Viewed 83 times

Let's suppose to use PWM (e.g. to control the 'speed' of a motor)

What would be the possible way to generate a PWM signal?

On the one extreme, there is pure software techniques where 'a programmer typically writes a value to a memory-mapped register to set the duty cycle' [Lee & Seshia, Introduction to Embedded Systems]. On the other extreme, there is dedicated PWM Peripheral. What are the other ways to genrate a PWM?

edited Jan 31 '18 at 06:19

Mahendra Gunawardena

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asked Jan 31 '18 at 01:06

S12000

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'write a value to a register' is a terrible answer. I hope that textbook explains what that register does with that value. – Vince Patron Jan 31 '18 at 01:41
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is this a school assignment question? – jsotola Jan 31 '18 at 02:17
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Before asking a question on here, I highly advise you to look on this website and seeing if someone else has asked the same thing. For instance: What is the simplest way to generate PWM without a Microcontroller? is a question that can help you. I know, there are times where I think to myself, "There's no way someone has asked this question on this website." Turns out that I'm wrong 95% of the time when I want to ask a question. – Jan 31 '18 at 02:40
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two other ways are with an oscillator (like 555) and with phase-control (like light dimmers) – Jasen Слава Україні Jan 31 '18 at 08:33

What are the main ways to generate a pwm?

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