ATxmega256A3U Atmel Corporation, ATxmega256A3U Datasheet - Page 187
ATxmega256A3U
Manufacturer Part Number
ATxmega256A3U
Description
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
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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
187
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