ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 211

• Manufacturer Part Number: ATxmega128B1
• Manufacturer: Atmel Corporation

Specifications of ATxmega128B1

• Flash (kbytes): 128 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 53
• Ext Interrupts: 53
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Segment Lcd: 160
• 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
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 8
• Eeprom (bytes): 2048
• 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: 3
• Output Compare Channels: 10
• Input Capture Channels: 10
• Pwm Channels: 10
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

8291A–AVR–10/11
To maximize throughput, an endpoint address can be configured for ping-pong operation. When
done, the input and output endpoints are both used in the same direction. The CPU or DMA con-
troller can then read/write one data buffer while the USB module writes/reads the others, and
vice versa. This gives double buffered communication.
Multipacket transfer enables a data payload exceeding the maximum packet size of an endpoint
to be transferred as multiple packets without software intervention. This reduces the CPU inter-
vention and the interrupts needed for USB transfers.
For low-power operation, the USB module can put the microcontroller into any sleep mode when
the USB bus is idle and a suspend condition is given. Upon bus resumes, the USB module can
wake up the microcontroller from any sleep mode.
Figure 18-1. USB OUT transfer: data packet from host to USB device.
Figure 18-2. USB IN transfer: data packet from USB device to host after request from host.
HOST
DM
HOST
DP
DM
DP
EPT 2
BULK OUT
D
A
A
T
0
EPT 2
D
A
A
T
1
N
O
N
T
K
E
I
D
A
T
A
0
D
A
T
A
0
EPT 2
EPT 3
D
A
A
T
1
D
A
A
T
0
D
A
T
A
0
BULK OUT
D
A
T
A
1
N
O
N
EPT 3
T
K
E
I
D
A
T
A
0
D
A
T
A
0
D
A
T
A
D
A
T
A
1
1
EPT 3
D
A
T
A
0
D
A
A
T
0
EPT 1
D
A
T
A
1
BULK OUT
D
A
A
T
0
D
A
A
T
0
EPT 1
D
A
T
A
1
O
N
T
K
E
N
I
D
A
T
A
0
D
A
A
T
0
EPT 1
time
D
A
T
A
1
D
A
A
T
0
time
Atmel AVR XMEGA B
Buffers
Buffers
USB
USB
CPU
USB
USB
ENDPOINT 1 DATA
ENDPOINT 3 DATA
ENDPOINT 2 DATA
Configuration Table
ENDPOINT 1 DATA
ENDPOINT 3 DATA
ENDPOINT 2 DATA
Configuration Table
USB Endpoints
Internal SRAM
USB Endpoints
Internal SRAM
USBEPPTR
USBEPPTR
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