ATxmega256A3BU Atmel Corporation, ATxmega256A3BU Datasheet - Page 255

• 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

20.14.4
20.14.5
20.14.6
8331A–AVR–07/11
CNTH – Endpoint Counter High Byte
DATAPTRL – Endpoint Data Pointer Low Byte
DATAPTRH – Endpoint Data Pointer High Byte
• Bit 7:0 – CNT[7:0]: Endpoint Byte Counter
This byte contains the 8 LSB of the USB Endpoint Counter (CNT).
• Bit 6 – AZLP: Automatic Zero Length Packet
When this bit is set, the USB module will manage the ZLP handshake by hardware. This is for IN
endpoint only. When this bit is zero, the ZLP handshake must be managed by firmware.
• Bit 6:2 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always
write these bits to zero when this register is written.
• Bit 1:0 – CNT[9:8]: Endpoint Byte Counter
These bits contain the 2 MSB of the USB Endpoint Counter (CNT).
The DATAPTRL and DATAPTRH registers represent the 16-bit value DATAPTR that contains
the SRAM address to the endpoint data buffer.
• Bit 7:0 – DATAPTR[7:0]: Endpoint Dta Pointer Low Byte
This byte contains the 8 LSB of the Endpoint Data Pointer (DATAPTR).
Bit
+0x04
Read/Write
Initial Value
Bit
+0x05
Read/Write
Initial Value
Bit
+0x03
Read/Write
Initial Value
Bit
+0x02
Read/Write
Initial Value
R/W
R/W
AZLP
R/W
R/W
7
X
7
X
X
X
7
7
R/W
R/W
R/W
X
X
6
6
6
X
R
X
6
–
R/W
R/W
R/W
X
X
5
5
X
5
5
–
R
X
R/W
R/W
R/W
4
X
4
X
DATAPTR[15:8]
DATAPTR[7:0]
X
R
4
4
–
X
CNT[7:0]
R/W
R/W
Atmel AVR XMEGA AU
R/W
3
X
3
X
3
X
R
X
3
–
R/W
R/W
R/W
X
X
2
2
2
X
R
X
2
–
R/W
R/W
R/W
R/W
X
X
1
1
X
1
1
X
CNT[9:8]
R/W
R/W
R/W
R/W
0
X
0
X
X
0
0
X
DATAPTRL
DATAPTRH
CNTL
CNTH
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