XMega News

XMega + USB

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Re: XMega News

 ·  Gepostet: 09.10.2011 - 15:53 Uhr  ·  #9
yes, Gunter is right.

There are some priorities how XMega support goes on:
XMega USB support (XMega U-types)
XMega PDI debugging, including ISP3 firmware updates
XMega Boot support
AppWizard XMega support

rolf
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Re: XMega News

 ·  Gepostet: 09.10.2011 - 16:36 Uhr  ·  #10
@all,

today I made some speed tests with an XMega128A1 using overclocking. Fantastic results !!!!
Code
           OSCtype = int32MHz,
           PLLmul  = 8,      // 64MHz !!!!!!!!!!!
           prescB  = 2,      // periph clockB 32MHz
           prescC  = 1,      // periph clockC 32MHz
           overdrive;        // allow overclocking

Of course I didn't test very much. But a small application runs without any problems.
Blinking LEDs, UART, ADC etc.

rolf
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Re: XMega News

 ·  Gepostet: 09.10.2011 - 19:01 Uhr  ·  #11
Hello Rolf.
Zitat geschrieben von rh

@all,

today I made some speed tests with an XMega128A1 using overclocking. Fantastic results !!!!
Code
           OSCtype = int32MHz,
           PLLmul  = 8,      // 64MHz !!!!!!!!!!!
           prescB  = 2,      // periph clockB 32MHz
           prescC  = 1,      // periph clockC 32MHz
           overdrive;        // allow overclocking

Of course I didn't test very much. But a small application runs without any problems.
Blinking LEDs, UART, ADC etc.

rolf

I think it is an nice Way to boost a CPU. :D

Thorsten
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Re: XMega News

 ·  Gepostet: 09.10.2011 - 19:18 Uhr  ·  #12
Hello Thorsten,

yes, overwelming. And the case temperature of the XMega stays at 5gradC above room temperature :devil:
Tomorrow we will test our new XMega USB driver with 64MHz. Its a very complex application. I'm curious about the results.

rolf
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Re: XMega News

 ·  Gepostet: 11.10.2011 - 14:31 Uhr  ·  #13
XMega users,

more and better tests showed that the secure limit of the XMega128A1 max clock is about 40MHz.
The XMega256A3U runs with 64MHz without any problems !!!
It seems that the new U-devices are more shrinked and have faster flash ! :devil:

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Re: XMega News

 ·  Gepostet: 12.10.2011 - 19:06 Uhr  ·  #14
@all,
there a two new PDFs from Atmel concerning the differences between the non-"U" devices and the "U"-devices. Some differences maybe less important for existing or future designs, some differences maybe essential.

So one should be careful when selecting an XMega. To avoid any bad surprises I suggest reading these PDFs carefully will help the choice. Better is to use the "U" devices for new designs only.
One argument can be the speed results above :love:

rolf
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Re: XMega News

 ·  Gepostet: 14.10.2011 - 20:26 Uhr  ·  #15
Please note:
-----------------
When XMega overclocking is used the supply voltage must be 3.3V...3.6V
The brownout level must be set to 2.6V...3.0Volt
The brownout values (fuses) differ somwhat between "U" and "non-U" devices.
Anyway, a proper setting of the brownout fuses is strongly recommended!

rolf
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Re: XMega News

 ·  Gepostet: 14.03.2012 - 00:01 Uhr  ·  #16
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