XMEGA A4U [DATASHEET]
Atmel-8387G-AVR-ATxmega16A4U-34A4U-64A4U-128A4U-Datasheet_03/2014
330
38.2
ATxmega32A4U
38.2.1 Rev. E
ADC may have missing codes in SE unsigned mode at low temp and low Vcc
CRC fails for Range CRC when end address is the last word address of a flash section
AWeX fault protection restore is not done correct in Pattern Generation Mode
1.
ADC may have missing codes in SE unsigned mode at low temp and low Vcc
The ADC may have missing codes i single ended (SE) unsigned mode below 0C when Vcc is below 1.8V.
Problem fix/Workaround
Use the ADC in SE signed mode.
2.
CRC fails for Range CRC when end address is the last word address of a flash section
If boot read lock is enabled, the range CRC cannot end on the last address of the application section. If applica-
tion table read lock is enabled, the range CRC cannot end on the last address before the application table.
Problem fix/Workaround
Ensure that the end address used in Range CRC does not end at the last address before a section with read lock
enabled.
Instead, use the dedicated CRC commands for complete applications sections.
3.
AWeX fault protection restore is not done correct in Pattern Generation Mode
When a fault is detected the OUTOVEN register is cleared, and when fault condition is cleared, OUTOVEN
is restored according to the corresponding enabled DTI channels. For Common Waveform Channel Mode
(CWCM), this has no effect as the OUTOVEN is correct after restoring from fault. For Pattern Generation
Mode (PGM), OUTOVEN should instead have been restored according to the DTLSBUF register.
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 cor-
rect OUTOVEN value and enable the DTI channels, before the direction (DIR) register is written to enable
the correct outputs again.
38.2.2 Rev. A - D
Not sampled.