Datasheet

305
XMEGA D4 [DATASHEET]
8135P–AVR–01/2014
Problem fix/Workaround
For CWCM no workaround is required.
For PGM in latched mode, disable the DTI channels before returning from the fault condition. Then, set correct
OUTOVEN value and enable the DTI channels, before the direction (DIR) register is written to enable the correct
outputs again.
For PGM in cycle-by-cycle mode there is no workaround.
4. Erroneous interrupt when using Timer/Counter with QDEC
When the Timer/Counter is set in Dual Slope mode with QDEC enabled, an additional underflow interrupt (and
event) will be given when the counter counts from BOTTOM to one.
Problem fix/Workaround
When receiving underflow interrupt check direction and value of counter. If direction is UP and counter value is
zero, change the counter value to one. This will also remove the additional event. If the counter value is above
zero, clear the interrupt flag.
5. AC system status flags are only valid if AC-system is enabled
The status flags for the ac-output are updated even though the AC is not enabled which is invalid. Also, it is not
possible to clear the AC interrupt flags without enabling either of the Analog comparators.
Problem fix/Workaround
Software should clear the AC system flags once, after enabling the AC system before using the AC system status
flags.
6. Temperature sensor not calibrated
Temperature sensor factory calibration not implemented.
Problem fix/Workaround
None.
34.1.4 Rev. C/D
Not sampled.