ATEVK1104 Atmel, ATEVK1104 Datasheet - Page 677

• Manufacturer Part Number: ATEVK1104
• Description: KIT DEV/EVAL FOR AVR32 AT32UC3A
• Manufacturer: Atmel
• Series: AVR®32r
• Type: MCUr

Specifications of ATEVK1104

• Contents: Evaluation Board, Software and Documentation
• Processor To Be Evaluated: AT32UC3A3
• Data Bus Width: 32 bit
• Interface Type: USB, SPI, USART
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Core Sub-architecture: AVR UC3
• Silicon Core Number: AT32UC3A3256
• Silicon Family Name: AVR
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT32UC3A3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

32.6.2
32.6.2.1
Figure 32-3. Functional View of the Channel Block Diagram
32.6.2.2
32058J–AVR32–04/11
PWM Channel
Block Diagram
inputs from
Waveform Properties
from clock
Peripheral
generator
inputs
Bus
Channel
The clock generator is divided in three blocks:
Each linear divider can independently divide one of the clocks of the modulo n counter. The
selection of the clock to be divided is made according to the PREA (PREB) field of the PWM
Mode register (MR). The resulting clock clkA (clkB) is the clock selected divided by DIVA (DIVB)
field value in the PWM Mode register (MR).
After a reset of the PWM controller, DIVA (DIVB) and PREA (PREB) in the PWM Mode register
are set to 0. This implies that after reset clkA (clkB) are turned off.
At reset, all clocks provided by the modulo n counter are turned off except clock “clk”. This situa-
tion is also true when the PWM master clock is turned off through the Power Management
Controller.
Each of the 7 channels is composed of three blocks:
• A clock selector which selects one of the clocks provided by the clock generator described in
• An internal counter clocked by the output of the clock selector. This internal counter is
• A comparator used to generate events according to the internal counter value. It also computes
The different properties of output waveforms are:
• the internal clock selection. The internal channel counter is clocked by one of the clocks
• the waveform period. This channel parameter is defined in the CPRD field of the CPRDx
Selector
Clock
Section 32.6.1 ”PWM Clock Generator” on page
incremented or decremented according to the channel configuration and comparators events.
The size of the internal counter is 20 bits.
the PWMx output waveform according to the configuration.
provided by the clock generator described in the previous section. This channel parameter is
defined in the CPRE field of the CMRx register. This field is reset at 0.
register.
– a modulo n counter which provides 11 clocks: F
– two linear dividers (1, 1/2, 1/3, ... 1/255) that provide two separate clocks: clkA and
F
clkB
MCK
/32, F
MCK
/64, F
Counter
Internal
MCK
/128, F
MCK
/256, F
Comparator
MCK
676.
/512, F
MCK
, F
MCK
MCK
/1024
/2, F
MCK
PWMx output waveform
/4, F
AT32UC3A
MCK
/8, F
MCK
/16,
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