Datasheet

32059L–AVR32–01/2012

AT32UC3B

16. Increased Power Consumption in VDDIO in sleep modes

If the OSC0 is enabled in crystal mode when entering a sleep mode where the OSC0 is dis-

abled, this will lead to an increased power consumption in VDDIO.

Fix/Workaround

Disable the OSC0 through the Power Manager (PM) before going to any sleep mode where

the OSC0 is disabled, or pull down or up XIN0 and XOUT0 with 1Mohm resistor.

17. SSC

18. Additional delay on TD output

A delay from 2 to 3 system clock cycles is added to TD output when:

TCMR.START = Receive Start,

TCMR.STTDLY = more than ZERO,

RCMR.START = Start on falling edge / Start on Rising edge / Start on any edge,

RFMR.FSOS = None (input).

Fix/Workaround

None.

19. TF output is not correct

TF output is not correct (at least emitted one serial clock cycle later than expected) when:

TFMR.FSOS = Driven Low during data transfer/ Driven High during data transfer

TCMR.START = Receive start

RFMR.FSOS = None (Input)

RCMR.START = any on RF (edge/level)

Fix/Workaround

None.

20. Frame Synchro and Frame Synchro Data are delayed by one clock cycle

The frame synchro and the frame synchro data are delayed from 1 SSC_CLOCK when:

- Clock is CKDIV

- The START is selected on either a frame synchro edge or a level

- Frame synchro data is enabled

- Transmit clock is gated on output (through CKO field)

Fix/Workaround

Transmit or receive CLOCK must not be gated (by the mean of CKO field) when START

condition is performed on a generated frame synchro.

21. USB

22. UPCFGn.INTFRQ is irrelevant for isochronous pipe

As a consequence, isochronous IN and OUT tokens are sent every 1ms (Full Speed), or

every 125uS (High Speed).

Fix/Workaround

For higher polling time, the software must freeze the pipe for the desired period in order to

prevent any "extra" token.

- ADC

1. Sleep Mode activation needs additional A to D conversion

If the ADC sleep mode is activated when the ADC is idle the ADC will not enter sleep mode

before after the next AD conversion.

Fix/Workaround

Activate the sleep mode in the mode register and then perform an AD conversion.