AT32UC3A464 Atmel Corporation, AT32UC3A464 Datasheet - Page 43

• Manufacturer Part Number: AT32UC3A464
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A464

• Flash (kbytes): 64 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 66 MHz
• Cpu: 32-bit AVR
• Hardware Qtouch Acquisition: No
• Usb Transceiver: 1
• Usb Speed: Hi-Speed
• Usb Interface: Device + OTG
• Spi: 6
• Twi (i2c): 2
• Uart: 4
• Ssc: 1
• Sd / Emmc: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 128
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.0 to 3.6
• Operating Voltage (vcc): 3.0 to 3.6
• Fpu: No
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

7.4
7.4.1
7.4.2
7.5
7.5.1
7.5.2
32072G–11/2011
Product Dependencies
Functional Description
I/O Lines
Interrupt
Slow Clock
Oscillator 0 and 1 Operation
The PM provides a number of generic clock outputs, which can be connected to output pins,
multiplexed with I/O lines. The user must first program the I/O controller to assign these pins to
their peripheral function. If the I/O pins of the PM are not used by the application, they can be
used for other purposes by the I/O controller.
The PM interrupt line is connected to one of the internal sources of the interrupt controller. Using
the PM interrupt requires the interrupt controller to be programmed first.
The slow clock is generated from an internal RC oscillator which is always running, except in
Static mode. The slow clock can be used for the main clock in the device, as described in
tion
the Power Manager.
The RC oscillator has a 3 cycles startup time, and is always available when the CPU is running.
The RC oscillator operates at approximately 115 kHz. Software can change RC oscillator cali-
bration through the use of the RCCR register. Please see the Electrical Characteristics section
for details.
RC oscillator can also be used as the RTC clock when crystal accuracy is not required.
The two main oscillators are designed to be used with an external crystal and two biasing capac-
itors, as shown in
device, as described in
clocks, as described in
The oscillators are disabled by default after reset. When the oscillators are disabled, the XIN and
XOUT pins can be used as general purpose I/Os. When the oscillators are configured to use an
external clock, the clock must be applied to the XIN pin while the XOUT pin can be used as a
general purpose I/O.
The oscillators can be enabled by writing to the OSCnEN bits in MCCTRL. Operation mode
(external clock or crystal) is chosen by writing to the MODE field in OSCCTRLn. Oscillators are
automatically switched off in certain sleep modes to reduce power consumption, as described in
Section
After a hard reset, or when waking up from a sleep mode that disabled the oscillators, the oscil-
lators may need a certain amount of time to stabilize on the correct frequency. This start-up time
can be set in the OSCCTRLn register.
The PM masks the oscillator outputs during the start-up time, to ensure that no unstable clocks
propagate to the digital logic. The OSCnRDY bits in POSCSR are automatically set and cleared
according to the status of the oscillators. A zero to one transition on these bits can also be con-
figured to generate an interrupt, as described in
7.5.5. The slow clock is also used for the Watchdog Timer and measuring various delays in
7.5.7.
Figure 7-2 on page
Section
Section
7.5.8.
7.5.5. Both oscillators can be used as source for the generic
44. Oscillator 0 can be used for the main clock in the
Section
7.6.7.
Sec-
43