ATxmega256A3U Atmel Corporation, ATxmega256A3U Datasheet - Page 156

• Manufacturer Part Number: ATxmega256A3U
• Manufacturer: Atmel Corporation

Specifications of ATxmega256A3U

• Flash (kbytes): 256 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 50
• Ext Interrupts: 50
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 10
• Twi (i2c): 2
• Uart: 7
• 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: 2
• Dac Resolution (bits): 12
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 16
• Eeprom (bytes): 4096
• 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: 7
• Output Compare Channels: 22
• Input Capture Channels: 22
• Pwm Channels: 22
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

13.14.4
8331A–AVR–07/11
CLKEVOUT – Clock and Event Out Register
• Bit 3:0 – VP2MAP: Virtual Port 2 Mapping
These bits decide which ports should be mapped to Virtual Port 2. The registers DIR, OUT, IN,
and INTFLAGS will be mapped. Accessing the virtual port registers is equal to accessing the
actual port registers. See
Table 13-6.
• Bit 7 – CLKEVPIN: Clock and Event Output Pin Select
Setting this pin enables output of clock and event pins on port pin 4 instead of port pin 7.
• Bit 6 – RTCOUT: RTC Clock Output Enable
Setting this bit enables output of the RTC clock source on PORTC pin 6.
• Bit 5:4 – EVOUT[1:0]: Event Output Port
These bits decide which port event channel 0 from the event system will be output to. Pin 7 on
the selected port is the default used, and the CLKOUT bits must be set differently from those of
EVOUT. The port pin must be configured as output for the event to be available on the pin.
Bit
+0x04
Read/Write
Initial Value
VPnMAP[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
CLKEVPIN
R/W
7
0
Virtual port mapping.
RTCOUT
Group Configuration
PORTA
PORTB
PORTC
PORTD
PORTE
PORTF
PORTG
PORTH
PORTJ
PORTK
PORTL
PORTM
PORTN
PORTP
PORTQ
PORTR
R/W
6
0
Table 13-6
R/W
5
0
EVOUT[1:0]
for configuration.
R/W
4
0
Atmel AVR XMEGA AU
R/W
CLKOUTSEL[1:0]
3
0
Description
PORTA mapped to Virtual Port n
PORTB mapped to Virtual Port n
PORTC mapped to Virtual Port n
PORTD mapped to Virtual Port n
PORTE mapped to Virtual Port n
PORTF mapped to Virtual Port n
PORTG mapped to Virtual Port n
PORTH mapped to Virtual Port n
PORTJ mapped to Virtual Port n
PORTK mapped to Virtual Port n
PORTL mapped to Virtual Port n
PORTM mapped to Virtual Port n
PORTN mapped to Virtual Port n
PORTP mapped to Virtual Port n
PORTQ mapped to Virtual Port n
PORTR mapped to Virtual Port n
R/W
2
0
R/W
1
0
CLKOUT[1:0]
R/W
0
0
CLKEVOUT
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