ATxmega256A3 Atmel Corporation, ATxmega256A3 Datasheet - Page 174
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ATxmega256A3
Manufacturer Part Number
ATxmega256A3
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega256A3
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 Speed
No
Usb Interface
No
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 PERBUFL - Timer/Counter Period Buffer L
14.12.20 CCxBUFH - Compare or Capture x Buffer Register H
14.12.21 CCxBUFL - Compare or Capture x Buffer Register L
8077H–AVR–12/09
• Bit 7:0 - PERBUF[15:8]
These bits holds the 8 MSB of the 16-bit Period Buffer register.
• Bit 7:0 - PERBUF[7:0]
These bits holds the 8 LSB 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 register using CPU or DMA will affect the corresponding CCxBV status bit.
• Bit 7:0 - CCxBUF[15:8]
These bits holds the 8 MSB of the 16-bit Compare or Capture Buffer register.
• Bit 7:0 - CCxBUF[7:0]
These bits holds the 8 LSB 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
Bit
+0x36
Read/Write
Initial Value
R/W
R/W
R/W
R/W
7
1
7
0
7
1
7
0
R/W
R/W
R/W
R/W
6
1
6
0
6
0
6
1
R/W
R/W
R/W
R/W
5
1
5
0
5
0
5
1
R/W
R/W
R/W
R/W
4
1
4
0
4
0
4
1
PERBUF[15:8]
CCxBUF[15:8]
CCxBUFx[7:0]
PERBUF[7:0]
R/W
R/W
R/W
R/W
3
1
3
0
3
1
3
0
R/W
R/W
R/W
R/W
2
1
2
0
2
1
2
0
R/W
R/W
R/W
R/W
1
1
1
0
1
1
1
0
XMEGA A
R/W
R/W
R/W
R/W
0
1
0
1
0
0
0
0
PERBUFH
CCxBUFH
PERBUFL
CCxBUFL
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