AT32UC3A3256AU Atmel Corporation, AT32UC3A3256AU Datasheet - Page 53

• Manufacturer Part Number: AT32UC3A3256AU
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A3256AU

• Flash (kbytes): 256 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: 110
• Ext Interrupts: 110
• Usb Transceiver: 1
• Usb Speed: Hi-Speed
• Usb Interface: Device + OTG
• Spi: 6
• Twi (i2c): 2
• Uart: 4
• Lin: 4
• Ssc: 1
• Sd / Emmc: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 384
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 16
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 128
• Self Program Memory: YES
• External Bus Interface: 1
• Dram Memory: sdram
• 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
• Mpu / Mmu: Yes / No
• Timers: 6
• Output Compare Channels: 18
• Input Capture Channels: 12
• Pwm Channels: 12
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

Table 7-4.
7.5.11.1
7.5.11.2
32072G–11/2011
CPU/HSB/PBA/PBB
(excluding Power Manager)
32 KHz oscillator
RTC control register
GPLP registers
Watchdog control register
Voltage calibration register
RCSYS Calibration register
BOD control register
BOD33 control register
Bandgap control register
Clock control registers
Osc0/Osc1 and control registers
PLL0/PLL1 and control registers
OCD system and OCD registers
Power-On detector
Brown-Out detector
Effect of the Different Reset Events
Table 7-4 on page 53
The cause of the last reset can be read from the RCAUSE register. This register contains one bit
for each reset source, and can be read during the boot sequence of an application to determine
the proper action to be taken.
The Power-On Detector monitors the VDDCORE supply pin and generates a reset when the
device is powered on. The reset is active until the supply voltage from the linear regulator is
above the power-on threshold level. The reset will be re-activated if the voltage drops below the
power-on threshold level. See Electrical Characteristics for parametric details.
The Brown-Out Detector (BOD) monitors the VDDCORE supply pin and compares the supply
voltage to the brown-out detection level, as set in BOD.LEVEL. The BOD is disabled by default,
but can be enabled either by software or by flash fuses. The Brown-Out Detector can either gen-
erate an interrupt or a reset when the supply voltage is below the brown-out detection level. In
any case, the BOD output is available in bit POSCSR.BODDET bit.
Note that any change to the BOD.LEVEL field of the BOD register should be done with the BOD
deactivated to avoid spurious reset or interrupt.
See Electrical Characteristics chapter for parametric details.
Power-On
Reset
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
External
Reset
Y
N
N
N
Y
N
N
Y
Y
Y
Y
Y
Y
Y
lists parts of the device that are reset, depending on the reset source.
Watchdog
Reset
Y
N
N
N
N
N
N
N
N
N
Y
Y
Y
N
BOD
Reset
Y
N
N
N
Y
N
N
N
N
N
Y
Y
Y
Y
BOD33
Reset
Y
N
N
N
Y
N
N
N
N
N
Y
Y
Y
Y
CPU
Error
Reset
Y
N
N
N
Y
N
N
N
N
N
Y
Y
Y
Y
OCD
Reset
Y
N
N
N
Y
N
N
N
N
N
Y
Y
Y
N
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