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PIC18f2331, PWM module

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hisham.i

Joined: 22 Aug 2010
Posts: 43

PIC18f2331, PWM module

Posted: Fri Aug 27, 2010 7:49 am

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Hello,
Am using pic18f2331, and I want to get pwm outputs...but am not so good in pwm, so I want to know some information about the parameters of pwm functions.

Code:

setup_power_pwm(modes, postscale, time_base, period, compare, compare_postscale, dead_time)

What is meant by the time base?
How can I calculate it?
The second thing is in the calculation of the pwm period. In the data sheet there is a parameter called PTMRPS, which I don't know what it is.

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Fri Aug 27, 2010 3:30 pm

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The 18F2331 data sheet says what it is:

Quote:

17.3 PWM Time Base
The PWM time base is provided by a 12-bit timer with
prescaler and postscaler functions.

That's the PTMR register in the PIC data sheet.

This post has some example code, and a brief explanation of the
parameters.
http://www.ccsinfo.com/forum/viewtopic.php?t=30061&start=7

The CCS manual also will help, if you download it.

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