![](http://datasheet.mmic.net.cn/100000/IF180C52TXXX-20R_datasheet_3493957/IF180C52TXXX-20R_823.png)
823
32099I–01/2012
AT32UC3L016/32/64
2.
It is not possible to mask the request clock requests
It is not possible to mask the request clock requests using PPCR.
Fix/Workaround
None.
3.
Static mode cannot be entered if the WDT is using OSC32
If the WDT is using OSC32 as clock source and the user tries to enter Static mode, the
Deepstop mode will be entered instead.
Fix/Workaround
None.
4.
Clock Failure Detector (CFD) does not work
Clock Failure Detector (CFD) does not work.
Fix/Workaround
None.
5.
WCAUSE register should not be used
The WCAUSE register should not be used.
Fix/Workaround
None.
6.
PB writes via debugger in sleep modes are blocked during sleepwalking
During sleepwalking, PB writes performed by a debugger will be discarded by all PB mod-
ules except the module that is requesting the clock.
Fix/Workaround
None.
7.
Clock sources will not be stopped in Static mode if the difference between CPU and
PBx division factor is larger than 4
If the division factor between the CPU/HSB and PBx frequencies is more than 4 when enter-
ing a sleep mode where the system RC oscillator (RCSYS) is turned off, the high speed
clock sources will not be turned off. This will result in a significantly higher power consump-
tion during the sleep mode.
Fix/Workaround
Before going to sleep modes where RCSYS is stopped, make sure the division factor
between CPU/HSB and PBx frequencies is less than or equal to 4.
8.
Disabling POR33 may generate spurious resets
Depending on operating conditions, POR33 may generate a spurious reset in one of the fol-
lowing cases:
- When POR33 is disabled from the user interface
- When SM33 supply monitor is enabled
- When entering Shutdown mode while debugging the chip using JTAG or aWire interface
In the listed cases, writing a one to the bit VREGCR.POR33MASK in the System Control
Interface (SCIF) to mask the POR33 reset will be ineffective
Fix/Workaround
- Do not disable POR33 using the user interface
- Do not use the SM33 supply monitor
- Do not enter Shutdown mode if a debugger is connected to the chip
9.
Instability when exiting sleep walking
If all the following operating conditions are true, exiting sleep walking might lead to
instability: