Mega32 Analog Comparator

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daveavr
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Posted by daveavr: Thu. Feb 22, 2007 - 09:47 PM
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Hey Freaks :D ,

According to the datasheet, if you set the ACBG bit of the ACSR register, a fixed voltage reference replaces the positive input of the comparator. Does this mean that the pin is freed up to be used for another function or do you have to leave it unconnected?

Cheers
Dave.

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AVR Microcontrollers, megaAVR and tinyAVR
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dkinzer
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Posted by dkinzer: Fri. Feb 23, 2007 - 05:20 AM
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daveavr wrote:
Does this mean that the pin is freed up to be used for another function or do you have to leave it unconnected?

I assume that you refer to PB2 (AIN0). The diagram in the Analog Comparator section suggests that PB2 would be free for other uses. A quick test could confirm that.

Don Kinzer
ZBasic Microcontrollers
http://www.zbasic.net

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Nuno
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Posted by Nuno: Fri. Feb 23, 2007 - 03:41 PM
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I'm using the internal voltage ref for the comparator and using PWM on PB2, at the same time, and it works (on a tiny26, but it should be the same).

Embedded Dreams
One day, knowledge will replace money.

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daveavr
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Posted by daveavr: Mon. Feb 26, 2007 - 11:53 PM
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Thanks Nuno!

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