ATxmega256A3BU Atmel Corporation, ATxmega256A3BU Datasheet - Page 187

• Manufacturer Part Number: ATxmega256A3BU
• Manufacturer: Atmel Corporation

Specifications of ATxmega256A3BU

• 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: 47
• Ext Interrupts: 49
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 8
• Twi (i2c): 2
• Uart: 6
• 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

14.12.19 PERBUFH – Timer/Counter Period Buffer H
14.12.20 CCxBUFL – Compare or Capture x Buffer Register L
14.12.21 CCxBUFH – Compare or Capture x Buffer Register H
8331A–AVR–07/11
• Bit 7:0 – PERBUF[7:0]
These bits hold the LSB of the 16-bit period buffer register.
• Bit 7:0 – PERBUF[15:8]
These bits hold the MSB of the 16-bit period buffer register.
The CCxBUFH and CCxBUFL register pair represents the 16-bit value, CCxBUF. These 16-bit
registers serve as the buffer for the associated compare or capture registers (CCx). Accessing
any of these registers using the CPU or DMA will affect the corresponding CCxBV status bit.
• Bit 7:0 – CCxBUF[7:0]
These bits hold the LSB of the 16-bit compare or capture buffer register.
• Bit 7:0 – CCxBUF[15:8]
These bits hold the MSB of the 16-bit compare or capture buffer register.
Bit
+0x37
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
R/W
R/W
R/W
7
1
7
0
7
0
R/W
R/W
R/W
6
1
6
0
6
0
R/W
R/W
R/W
5
1
5
0
5
0
R/W
R/W
R/W
4
1
4
0
4
0
PERBUF[15:8]
CCxBUF[15:8]
CCxBUFx[7:0]
Atmel AVR XMEGA AU
R/W
R/W
R/W
3
1
3
0
3
0
R/W
R/W
R/W
2
1
2
0
2
0
R/W
R/W
R/W
1
1
1
0
1
0
R/W
R/W
R/W
0
1
0
0
0
0
PERBUFH
CCxBUFH
CCxBUFL
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