AT32UC3L-EK Atmel, AT32UC3L-EK Datasheet - Page 253

• Manufacturer Part Number: AT32UC3L-EK
• Description: KIT EVAL AVR32 UC3 MCU
• Manufacturer: Atmel
• Type: MCUr

Specifications of AT32UC3L-EK

• Contents: *
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Core Sub-architecture: UC3L
• Kit Contents: Board
• Features: USB / Battery Powered, Board Controller / Bootloader
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes
• Tool Type: Starter Kit
• Cpu Core: AVR 8
• Data Bus Width: 8 bit
• Processor Series: AT32
• Processor To Be Evaluated: AT32UC3L064
• Interface Type: USB, Capacitive Touch
• For Use With/related Products: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

14.5.8
32099F–11/2010
Synchronization
If ADD is ‘1’, the prescaler frequency is increased:
Note that for these formulas to be within an error of 0.01%, it is recommended that the prescaler
bit that is used as the clock for the counter (selected by CR.PSEL) or to trigger the periodic inter-
rupt (selected by PIRn.INSEL) be bit 6 or higher.
As the prescaler and counter operate asynchronously from the user interface, the AST needs a
few clock cycles to synchronize the values written to the CR, CV, SCR, WER, EVE, EVD, PIRn,
ARn, and DTR registers. The Busy bit in the Status Register (SR.BUSY) indicates that the syn-
chronization is ongoing. During this time, writes to these registers will be discarded.
Note that synchronization takes place also if the prescaler is clocked from CLK_AST.
f
TUNED
=
f
0
⎛
⎜
⎜
⎜
⎝
1
+
------------------------------------------------------------------------------- -
roundup
AT32UC3L016/32/64
⎛
⎝
------------------- -
VALUE
256
1
⎞
⎠
⋅
(
2
EXP
)
–
1
⎞
⎟
⎟
⎟
⎠
253