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Forum Index : Microcontroller and PC projects : It’s a silly question, but...

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Xiongmao

Regular Member

Joined: 25/08/2011
Location: Australia
Posts: 48

Posted: 05:12am 28 Aug 2011

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Has anyone tried clocking a PIC32 past 80 MHz?
Did it work?
How far did you get?
Did you have to 'tweak' anything to get it there?

ksdesigns

Senior Member

Joined: 25/06/2011
Location: United States
Posts: 143

Posted: 05:18am 28 Aug 2011

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you can do 96mhz real easy seems stable .. some people on the microchip forums are doing like 120mhz
ken

Xiongmao

Regular Member

Joined: 25/08/2011
Location: Australia
Posts: 48

Posted: 06:22am 28 Aug 2011

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I figured that since the device is good for 80 at 2V and 80C, there must be a fair bit of headroom under 'ideal' conditions. I wonder what the LN2 freaks would get out of it?

Worm

Newbie

Joined: 30/06/2011
Location: New Zealand
Posts: 38

Posted: 12:07am 29 Aug 2011

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If you over clock the micro, does that effect the time and date function? eg. make the time and date run faster.

There's no such thing as a free lunch.

seco61
Senior Member

Joined: 15/06/2011
Location: Australia
Posts: 205

Posted: 02:01am 29 Aug 2011

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Worm said If you over clock the micro, does that effect the time and date function? eg. make the time and date run faster.

Yes, it will affect the time, date and timer functions.

The MMBasic firmware is using a timer interrupt to update these and it assumes that the clock is running at 80MHz.

Also, the video output may be affected as the timing for this is all based around the 80MHz clock.

These can all (relatively) easily be modified to handle your clock speed, but you will have to make the mods to the firmware.

Edited by seco61 2011-08-30

Regards

Gerard (vk3cg/vk3grs)

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