ATmega168/Timer1 PWM mode: inverting/non inverting

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franziski
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Joined: Sun. Feb 4, 2007
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Location: Naples province, Southern Italy
#1
Posted by franziski: Sun. Apr 22, 2012 - 07:38 PM
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According pag. 131 of ATmega168 d/s, by setting

COM1A1/COM1A0 bits=2

(Clear OC1A/OC1B on Compare Match when upcounting.
Set OC1A/OC1B on Compare Match when
downcounting)

while by setting:

COM1A1/COM1A0 bits=3, (Set OC1A/OC1B on Compare Match when upcounting.
Clear OC1A/OC1B on Compare Match
when downcounting)

The first option should be result in a inverted wave, while the second option should be result in a "non inverted" wave

Are you agree?

My (HW && SW) Setup: (MyAVR USB Programmer | bread-board | Butterfly | Arduino 10k | ATtiny2313 | ATmega8) && (WinAVR | AVR asm | AVRstudio)

Tags:

AVR Microcontrollers, megaAVR and tinyAVR, ATmega16, ATmega168
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Visovian
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Joined: Tue. Aug 7, 2007
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Location: Czechia
Posted by Visovian: Mon. Apr 23, 2012 - 06:26 AM
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I think for noninverting mode the folowing is true:
The greater OCRxx value, the wider the positive pulse.

Thus I can agree.

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