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RTC and the 32K ULP osc
On RTC there is application note "AVR1314: Using the XMEGA Real Time Counter" (with example code) For using the RTC for wake up you should look at "AVR1010: Minimizing the power...
Monday, 20 April 2015 - 05:28
Help to system Clock for XMEGA16A4
Maybe you measure the expected frequency the wrong way. A safe way to do this is for example a timer that gives aut a PWM.
Thursday, 16 April 2015 - 11:47
Help to system Clock for XMEGA16A4
This code sets the clock to 32Mhz (on internal osc.) and it locks almost as yours. So, maybe your code should work. OSC.CTRL |= 0x02; while(!(OSC.STATUS &...
Thursday, 16 April 2015 - 09:31
Do you consider the built-in offset of the ADC? It's around 0.05*VREF, so this may fit to your observation of 0.1..0.15. See application note AVR1300, which has exaple code that...
Wednesday, 15 April 2015 - 13:12
Help to system Clock for XMEGA16A4
There is an application note (AVR1003) that explains the clock system. It also has example code. If you you ask what's wrong with your code, you should show it.  
Wednesday, 15 April 2015 - 12:58
Does USART in ATxmega128A1U-AU are multiplexed?
1. You can do this by using interrupts. Each of the the up to 7 UART/USART has its own I/O pins. See application note AVR1307 for sample code.   2. eg "XMEGA A1U Xplained Pro...
Friday, 10 April 2015 - 07:38
TCC0.INTCTRLA = 0b00000011;This activates interrupt at high level. Add this level in PMIC_CTRL = PMIC_IVSEL_bm | PMIC_LOLVLEN_bm | PMIC_MEDLVLEN_bm | PMIC_HILVLEN_bm; 
Tuesday, 31 March 2015 - 05:59
Sry, i don't use avrdude.
Monday, 30 March 2015 - 10:53
I spooke about the xmega device datasheet. Google "XMEGA AU MANUAL", search in the PDF for "IVSEL".
Monday, 30 March 2015 - 10:27
XMEGA AES encryption and decryption issues, need help?
It seems partly you follow Does the problem occur if you follow the guide throughoutly?
Monday, 30 March 2015 - 10:23
Look for the IVSEL bit in the XMEGA AU datasheet. Normal applications and bootloaders use different interrupt vectors.
Monday, 30 March 2015 - 09:57
ATXMega256A3U - enable interrupt on USART reception
There is an application note about this: AVR1307 - Using the XMEGA USART It has a code example for using USART with interrupts.
Friday, 6 March 2015 - 14:53