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PWM I2C ... Timer2 ??

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PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Fri Apr 03, 2009 3:38 pm

Quote:

How can I activate and control the 3 channels : P1A, P1B and P1C ?

The 18F4525 has only 2 independent PWM channels. Each one can
have its own frequency and duty cycle.

One of the two channels is an ECCP channel. It can have up to 4 outputs
but they all run from the same PWM channel. They have the same
frequency, and the same duty cycle. The ECCP channel is intended
to drive a motor control circuit. It can be configured for Half-Bridge or
Full-Bridge mode.

With this PIC, you only have 2 independent, hardware PWM channels.
Do you understand this ?

jjacob

Joined: 08 Mar 2008
Posts: 54
Location: PORTUGAL (PORTO)

Posted: Sat Apr 04, 2009 4:35 am

Unfortunately i understand ...

Quote:

The ECCP channel is intended to drive a motor control circuit.

With this sentence, I understand why they talk about bridge and half bridge in the datasheet.

I'll change the PIC to 18F4331, as mentioned in topic:
http://www.ccsinfo.com/forum/viewtopic.php?t=37206

If i use this PIC and similar code to the referred topic, then I can have 3 (or more) independent duty cycle PWM.

Thank you for your explanation.
I'm always learning in this forum Very Happy

Jacob

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