Datasheet

103
[Not recommended for new designs - Use XMEGA A1U series] XMEGA A1 [DATASHEET]
8067O–AVR–06/2013
Problem fix/Workaround
Disable Flash Power Reduction mode before entering sleep mode.
29. Some NVM Commands are non-functional
The following NVM commands are non-functional:
Problem fix/Workaround
None for Flash Range CRC
Use separate programming commands for accessing application and boot section.
30. Crystal start-up time required after power-save even if crystal is source for RTC
Even if 32.768 kHz crystal is used for RTC during sleep, the clock from the crystal will not be ready for the system
before the specified start-up time. See "XOSCSEL[3:0]: Crystal Oscillator Selection" in XMEGA A Manual. If BOD
is used in active mode, the BOD will be on during this period (0.5s).
Problem fix/Workaround
If faster start-up is required, go to sleep with internal oscillator as system clock.
31. Setting PRHIRES bit makes PWM output unavailable
Setting the HIRES Power Reduction (PR) bit for PORTx will make any Frequency or PWM output for the corre-
sponding Timer/Counters (TCx0 and TCx1) unavailable on the pin even if the Hi-Res is not used.
Problem fix/Workaround
Do not write the HIRES PR bit on PORTx when frequency or PWM output from TCx0/1 is used.
– 0x2B Erase Flash Page
– 0x2E Write Flash Page
– 0x2F Erase & Write Flash Page
– 0x3A Flash Range CRC
– 0x22 Erase Application Section Page
– 0x24 Write Application Section Page
– 0x25 Erase & Write Application Section Page
– 0x2A Erase Boot Loader Section Page
– 0x2C Write Boot Loader Section Page
– 0x2D Erase & Write Boot Loader Section Page