ATxmega64A4U Atmel Corporation, ATxmega64A4U Datasheet - Page 237
ATxmega64A4U
Manufacturer Part Number
ATxmega64A4U
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega64A4U
Flash (kbytes)
64 Kbytes
Pin Count
44
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
Hardware Qtouch Acquisition
No
Max I/o Pins
34
Ext Interrupts
34
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Twi (i2c)
2
Uart
5
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
12
Adc Resolution (bits)
12
Adc Speed (ksps)
2000
Analog Comparators
2
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
5
Output Compare Channels
16
Input Capture Channels
16
Pwm Channels
16
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATxmega64A4U-AU
Manufacturer:
ON
Quantity:
29 000
Company:
Part Number:
ATxmega64A4U-U
Manufacturer:
ATMEL
Quantity:
74
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20.4
8331A–AVR–07/11
SRAM Memory Mapping
Figure 20-5. In transaction state machine
The USB module uses internal SRAM to store the:
The Endpoint Pointer Register (EPPTR) is used to set the SRAM address for the endpoint con-
figuration table. The USB frame number (FRAMENUM) and transaction complete FIFO (FIFO)
locations are derived from this. Location of these areas is selectable inside the internal SRAM.
Figure 20-6 on page 238
• Endpoint configuration table
• USB frame number
• Transaction complete FIFO
STALL HANDSHAKE
STALL & NO ISO
gives the relative memory location of each area.
RAM FETCH IN CONFIGURATION TABLE
ENDPOINT STATUS ENABLED ?
ENDPOINT FIELD =< MAXEP ?
ADDRESS MATCH OK ?
DATA : CTRL & STATUS
ISO
DIR : IN ENDPOINT
Set OVF, OVFIF
IDLE
Yes
Yes
Yes
NAK0, set
NAK HANDSHAKE
In token
NO ISO
Atmel AVR XMEGA AU
No
No
ACK not received
No
WAIT ACK
NO ISO
RAM FETCH IN INTERNAL DATA RAM
SEND DATA(s) TO HOST
ACK OK
DATA : POINTER EPDTR
DIR : IN ENDPOINT
TOGGLE TGL IF NO ISO
SET USBTCIF & NAK0
ISO
237
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