AT32UC3C0512CAU Atmel Corporation, AT32UC3C0512CAU Datasheet - Page 83

• Manufacturer Part Number: AT32UC3C0512CAU
• Manufacturer: Atmel Corporation

Specifications of AT32UC3C0512CAU

• Flash (kbytes): 512 Kbytes
• Pin Count: 144
• Max. Operating Frequency: 66 MHz
• Cpu: 32-bit AVR
• # Of Touch Channels: 32
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 123
• Ext Interrupts: 144
• Usb Transceiver: 1
• Quadrature Decoder Channels: 2
• Usb Speed: Full Speed
• Usb Interface: Device + OTG
• Spi: 7
• Twi (i2c): 3
• Uart: 5
• Can: 2
• Lin: 5
• Ssc: 1
• Ethernet: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 16
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 4
• Resistive Touch Screen: No
• Dac Channels: 4
• Dac Resolution (bits): 12
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 68
• Self Program Memory: YES
• External Bus Interface: 1
• Dram Memory: sdram
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.0 to 3.6 or 4.5 to 5.5
• Operating Voltage (vcc): 3.0 to 3.6 or 4.5 to 5.5
• Fpu: Yes
• Mpu / Mmu: Yes / No
• Timers: 6
• Output Compare Channels: 22
• Input Capture Channels: 12
• Pwm Channels: 20
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

8.5.2
8.5.3
32117C–AVR-08/11
32KHz Oscillator (OSC32K) Operation
PLL Operation
Figure 8-1.
The 32 KHz oscillator (OSC32K) operates as described for the Oscillator above. The 32 KHz
oscillator is used as source clock for the Asynchronous Timer and the Watchdog Timer. The
32KHz oscillator can be used as source for the generic clocks, as described in
on page
The oscillator is disabled by default, but can be enabled by writing a one to the OSC32EN bit in
OSCCTRL32. The oscillator is an ultra-low power design and remains enabled in all sleep
modes.
While the 32 KHz oscillator is disabled, the XIN32 and XOUT32 pins are available as general
purpose I/Os. When the oscillator is configured to work with an external clock (MODE field in
OSCCTRL32 register), the external clock must be connected to XIN32 while the XOUT32 pin
can be used as a general purpose I/O.
The startup time of the 32KHz oscillator can be set in the OSCCTRL32, after which OSC32RDY
in PCLKSR is set. An interrupt can be generated on a zero to one transition of OSC32RDY.
As a crystal oscillator usually requires a very long startup time (up to 1 second), the 32 KHz
oscillator will keep running across resets, except Power-On-Reset.
The 32KHz oscillator is not controlled by the sleep controller, and will run in all sleep modes if
enabled.
The device contains two PLLs, PLL0 and PLL1. These are disabled by default, but can be
enabled to provide high frequency source clocks for synchronous or generic clocks. The PLLs
can take either Oscillator 0, Oscillator 1 or 8MHz RC Oscillator (RC8M) as reference clock. The
PLL output is divided by a multiplication factor, and the PLL compares the resulting clock to the
reference clock. The PLL will adjust its output frequency until the two compared clocks are
equal, thus locking the output frequency to a multiple of the reference clock frequency.
When the PLL is switched on, or when changing the clock source or multiplication factor for the
PLL, the PLL is unlocked and the output frequency is undefined. The PLL clock for the digital
logic is automatically masked when the PLL is unlocked, to prevent connected digital logic from
receiving a too high frequency and thus becoming unstable.
UC3C
C
i
84.
XOUT
XIN
Oscillator connections
C
L
C
C
LEXT
LEXT
AT32UC3C
”Generic Clocks”
83