ATxmega64A3U Atmel Corporation, ATxmega64A3U Datasheet - Page 253

• Manufacturer Part Number: ATxmega64A3U
• Manufacturer: Atmel Corporation

Specifications of ATxmega64A3U

• Flash (kbytes): 64 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): 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: 7
• Output Compare Channels: 22
• Input Capture Channels: 22
• Pwm Channels: 22
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

20.14.2
8331A–AVR–07/11
CTRL – Endpoint Control
• Bit 3 – BANK: Bank Select Flag
When ping-pong mode is enabled, this bit indicates which bank will be used for the next transac-
tion. BANK is toggled each time a transaction has completed successfully. This bit is not in use
when ping-pong is disabled. This flag is cleared by writing a one to its bit location.
• Bit 2 – BUSNACK1 : Data Buffer 1 Not Acknowledge Flag
When this flag is set, the USB module will discard incoming data to data buffer 1 in an OUT
transaction, and will not return any data from data buffer 1 in an IN transaction. For control, bulk
and interrupt endpoints a NAK handshake is returned. This flag is cleared by writing a one to its
bit location.
• Bit 1 – BUSNACK0 : Data Buffer 0 Not Acknowledge Flag
When this flag is set, the USB module will discard incoming data to data buffer 0 in an OUT
transaction, and will not return any data from data buffer 0 in an IN transaction. For control, bulk
and interrupt endpoints a NAK handshake is returned. This flag is cleared by writing a one to its
bit location.
• Bit 0 – TOGGLE : Data Toggle Flag
This indicates if a DATA0 or DATA1 PID is expected in the next data packet for an output end-
point, and if a DATA0 or DATA1 PID will be sent in the next transaction for an input endpoint.
This bit has no effect for isochronous endpoints, where both DATA0 and DATA1 PIDs are
accepted for output endpoint, and only DATA0 PIDs are sent for input endpoints.
Note:
• Bit 7:6 – TYPE[1:0]: Endpoint Type
These bits are used to enable and select the endpoint type. If the endpoint is disabled, the
remaining 7 endpoint configuration bytes are never read or written by the USB module and their
SRAM locations are free to use for other application data.
Table 20-4.
• Bit 5 – MULTIPKT: Multi Packet Transfer Enable
Setting this bit enables multi-packet transfers. Multi-packet transfer enables a data payload
exceeding the maximum packet size of an endpoint to be transferred as multiple packets without
Bit
+0x01
Read/Write
Initial Value
TYPE[1:0]
1. For isochronous endpoints
00
01
10
11
R/W
7
0
Endpoint type
TYPE[1:0]
R/W
DISABLE
CONTROL
BULK
ISOCHRONOUS
Group Configuration
6
0
MULTIPKT
R/W
5
0
PINGPONG
R/W
4
0
Description
Endpoint enabled
Control
Bulk/ Interrupt
Isochronous
INTDSBL
R/W
3
0
Atmel AVR XMEGA AU
STALL
R/W
2
0
SIZE[2:0]
R/W
1
0
SIZE[1:0]
(1)
R/W
0
0
CTRL
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