76
32099DS–06/2010
AT32UC3L016/32/64
If the WDT counter is cleared in the second half of the timeout period, the WDT will immedi-
ately issue a Watchdog reset.
Fix/Workaround
Use twice as long timeout period as needed and clear the WDT counter within the first half
of the timeout period. If the the WDT counter is cleared after the first half of the timeout
period, you will get a Watchdog reset immediately. If the WDT coutner s not cleared at all,
the time before the reset will be twice as long as needed.
10.4.10
FREQM
1.
Measured clock (CLK_MSR) sources 15-17 are shifted
CLKSEL = 14 selects the RC120M AW clock, CLKSEL = 15 selects the RC120M clock, and
CLKSEL = 16 selects the RC32K clock as source for the measured clock (CLK_MSR).
Fix/Workaround
None.
2.
GCLK5 can not be used as source for the CLK_MSR
The frequency for GCLK5 can not be measured by the FREQM.
Fix/Workaround
None.
10.4.11
GPIO
1.
GPIO interrupt can not be cleared when interrupts are disabled
The GPIO interrupt can not be cleared unless the interrupt is enabled for the pin.
Fix/Workaround
Enable interrupt for the corresponding pin, then clear the interrupt.
2.
VERSION register reads 0x210
The VERSION register reads 0x210 instead of 0x211.
Fix/Workaround
None.
10.4.12
USART
1.
The RTS output does not function correctly in hardware handshaking mode
The RTS signal is not generated properly when the USART receives data in hardware hand-
shaking mode. When the Peripheral DMA receive buffer becomes full, the RTS output
should go high, but it will stay low.
Fix/Workaround
Do not use the hardware handshaking mode of the USART. If it is necessary to drive the
RTS output high when the Peripheral DMA receive buffer becomes full, use the normal
mode of the USART. Configure the Peripheral DMA Controller to signal an interrupt when
the receive buffer is full. In the interrupt handler code, write a one to the RTSDIS bit in the
USART Control Register (CR). This will drive the RTS output high. After the next DMA trans-
fer is started and a receive buffer is available, write a one to the RTSEN bit in the USART
CR so that RTS will be driven low.
10.4.13
SPI
1.
SPI disable does not work in SLAVE mode
SPI disable does not work in SLAVE mode.
Fix/Workaround