AT32UC3B0512-A2UT Atmel, AT32UC3B0512-A2UT Datasheet - Page 38

• Manufacturer Part Number: AT32UC3B0512-A2UT
• Description: IC MCU AVR32 512K FLASH 64TQFP
• Manufacturer: Atmel
• Series: AVR®32 UC3r

Specifications of AT32UC3B0512-A2UT

• Core Processor: AVR
• Core Size: 32-Bit
• Speed: 60MHz
• Connectivity: I²C, IrDA, SPI, SSC, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 44
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 96K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• Controller Family/series: AT32UC3B
• No. Of I/o's: 44
• Ram Memory Size: 96KB
• Cpu Speed: 60MHz
• No. Of Timers: 1
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

9.5.3
9.5.4
32059K–03/2011
32 KHz oscillator operation
PLL operation
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
Figure 9-2.
The 32 KHz oscillator operates as described for Oscillator 0 and 1 above. The 32 KHz oscillator
is used as source clock for the Real-Time Counter.
The oscillator is disabled by default, but can be enabled by writing OSC32EN in OSCCTRL32.
The oscillator is an ultra-low power design and remains enabled in all sleep modes except Static
mode.
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 32 KHz oscillator can be set in the OSCCTRL32, after which OSC32RDY
in POSCSR 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 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 or 1 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.
The Voltage Controlled Oscillator inside the PLL can generate frequencies from 80 to 240 MHz.
To make the PLL output frequencies under 80 MHz the OTP[1] bitfield could be set. This will
divide the output of the PLL by two and bring the clock in range of the max frequency of the
CPU.
Oscillator connections
XO UT
XIN
”MODE: Oscillator Mode” on page
C
C
2
1
AT32UC3B
57.
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