AT32UC3L064-D3HR Atmel, AT32UC3L064-D3HR Datasheet - Page 95

• Manufacturer Part Number: AT32UC3L064-D3HR
• Description: MCU AVR32 64K FLASH 48TTLGA
• Manufacturer: Atmel
• Series: AVR®32 UC3r

Specifications of AT32UC3L064-D3HR

• Core Processor: AVR
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, PWM, WDT
• Number Of I /o: 36
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.62 V ~ 3.6 V
• Data Converters: A/D 9x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

10.4.8
10.4.9
32099F–11/2010
AST
WDT
17. RC120MVERSION register reads 0x100
18. GCLK5 is non-functional
19. DFLLIF might loose fine lock when dithering is disabled
20. PCLKSR.OSC32RDY bit might not be cleared after disabling OSC32K
1. AST wake signal is released one AST clock cycle after the BUSY bit is cleared
1. Clearing of the WDT in window mode
2. VERSION register reads 0x400
Fix/Workaround
None.
The RC120MVERSION register reads 0x100 instead of 0x101.
Fix/Workaround
None.
GCLK5 is non-functional.
Fix/Workaround
None.
When dithering is disabled, and fine lock has been acquired the DFLL might loose the fine
lock resulting in a up to 20% over-/undershoot.
Fix/Workaround
Solution 1: When the DFLL is used as main clock source the target frequency of the DFLL
should be 20% below the maximum operating frequency of the CPU. Don’t use the DFLL as
clock source for frequency sensitive applications.
Solution 2: Do not use the DFLL in closed loop mode.
In some cases the OSC32RDY bit in the PCLKSR register will not be cleared when OSC32K
is disabled.
Fix/Workaround
When re-enabling the OSC32K, read the PCLKSR.OSC32RDY bit. If this bit is:
0: Follow normal procedures.
1: Ignore the PCLKSR.OSC32RDY and ISR.OSC32RDY bit. Use the Frequency Meter
(FREQM) to determine if the OSC32K clock is ready. The OSC32K clock is ready when the
FREQM measures a non-zero frequency.
After writing to the Status Clear Register (SCR) the wake signal is released one AST clock
cycle after the BUSY bit in the Status Register (SR.BUSY) is cleared. If entering sleep mode
directly after the BUSY bit is cleared the part will wake up immediately.
Fix/Workaround
Read the Wake Enable Register (WER) and write this value back to the same register. Wait
for BUSY to clear before entering sleep mode.
In window mode, if the WDT is cleared
the counter will be cleared, but will not exit the window. If this occurs, the SR.WINDOW bit
will not be cleared after clearing the WDT.
Fix/Workaround
Check SR.WINDOW immediately after clearing the WDT. If set then clear the WDT once
more.
The VERSION register reads 0x400 instead of 0x402.
2
TBAN
CLK_WDT cycles after entering the window,
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