ATxmega128B3 Atmel Corporation, ATxmega128B3 Datasheet - Page 215

• Manufacturer Part Number: ATxmega128B3
• Manufacturer: Atmel Corporation

Specifications of ATxmega128B3

• Flash (kbytes): 128 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: 36
• Ext Interrupts: 36
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Segment Lcd: 100
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 2
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 4
• 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: 2
• Output Compare Channels: 6
• Input Capture Channels: 6
• Pwm Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

Figure 18-5. IN transaction.
18.4
8291A–AVR–10/11
SRAM Memory Mapping
IDLE
CONFIG
READ
READ
DATA
TOKEN
IN
BUSNACK0 and TRNCOMPL0 are set and TOGGLE is toggled. TRNIF is set and the endpoint's
configuration table address is written to the FIFO if the transcation complete FIFO mode is
enabled.
When an IN token is detected and the device address of the token packet does not match that of
the endpoint, the packet is discarded and the USB module returns to idle and waits for the next
token packet.
The USB module uses internal SRAM to store the:
The endpoint pointer register (EPPTR) is used to set the SRAM address for the endpoint config-
uration table. The USB frame number (FRAMENUM) and transaction complete FIFO (FIFO)
locations are derived from this. The locations of these areas are selectable inside the internal
SRAM.
ADDRESS
BUSNACK0
STALL &
NO ISO?
DATA
SET?
No
No
Figure on page 215
• Endpoint configuration table
• USB frame number
• Transaction complete FIFO
Yes
Yes
ADDRESS
PAYLOAD
MATCH?
ISO?
OK?
No
Yes
N
o
Y
Yes
No
s e
gives the relative memory location of each area.
ENDPOINT
STALL
CRC
NAK
ZLP
ENDPOINT?
LEGAL
ISO?
Yes
N
o
Y
e
No
s
Atmel AVR XMEGA B
CONFIG
READ
ACK
EP STATUS
ENABLED?
SET?
ACK
Yes
N
o
No
Y
e
s
UPDATE
STATUS
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