ATxmega32A4U Atmel Corporation, ATxmega32A4U Datasheet - Page 41

• Manufacturer Part Number: ATxmega32A4U
• Manufacturer: Atmel Corporation

Specifications of ATxmega32A4U

• Flash (kbytes): 32 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 34
• Ext Interrupts: 34
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 7
• Twi (i2c): 2
• Uart: 5
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 2
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 12
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 4
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.6 to 3.6
• Operating Voltage (vcc): 1.6 to 3.6
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 5
• Output Compare Channels: 16
• Input Capture Channels: 16
• Pwm Channels: 16
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

4.17.18
4.17.19
4.17.20
4.17.21
8331A–AVR–07/11
USBCAL1 – USB Pad Calibration Register 1
RCOSC48M – USB RCOSC Calibration
ADCACAL0 – ADCA Calibration Register 0
ADCACAL1 – ADCA Calibration Register 1
• Bit 7:0 – USBCAL1[7:0]: USB Pad Calibration Register 1
This byte contains byte 1 of the USB pin calibration data, and must be loaded into the USB
CALH register.
• Bit 7:0 – RCOSC48M[7:0]: 48MHz RSCOSC Calibration
This byte contains a 48MHz calibration value for the internal 32MHz oscillator. When this cali-
bration value is written to calibration register B for the 32MHz DFLL, the oscillator is calibrated to
48MHz to enable full-speed USB operation from internal oscillator.
Note:
ADCACAL0 and ADCACAL1 contain the calibration value for the analogtodigital converter A
(ADCA). Calibration is done during production test of the device. The calibration bytes are not
loaded automatically into the ADC calibration registers, so this must be done from software.
• Bit 7:0 – ADCACAL0[7:0]: ADCA Calibration Byte 0
This byte contains byte 0 of the ADCA calibration data, and must be loaded into the ADCA CALL
register.
Bit
+0x1B
Read/Write
Initial Value
Bit
+0x1C
Read/Write
Initial Value
Bit
+0x20
Read/Write
Initial Value
Bit
+0x21
Read/Write
Initial Value
The COMP2 and COMP1 registers inside the DFLL32M must be set to B71B.
R
R
R
R
7
x
7
x
7
x
7
x
R
R
R
R
6
x
6
x
6
x
6
x
R
R
R
R
5
5
5
5
x
x
x
x
4
R
4
R
4
R
4
R
x
x
x
x
48MBRCOSC[7:0]
ADCACAL0[7:0]
ADCACAL1[7:0]
USBCAL1[7:0]
R
R
R
R
3
x
3
x
3
x
3
x
Atmel AVR XMEGA AU
R
R
R
R
2
2
2
2
x
x
x
x
R
R
R
R
1
1
1
1
x
x
x
x
0
R
0
R
0
R
0
R
x
x
x
x
48MBRCOSC
ADCACAL0
ADCACAL1
USBCAL1
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