AT90USB82 Atmel Corporation, AT90USB82 Datasheet - Page 10
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AT90USB82
Manufacturer Part Number
AT90USB82
Description
Manufacturer
Atmel Corporation
Specifications of AT90USB82
Flash (kbytes)
8 Kbytes
Pin Count
32
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
Hardware Qtouch Acquisition
No
Max I/o Pins
22
Ext Interrupts
21
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
0.5
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
2
Output Compare Channels
5
Input Capture Channels
1
Pwm Channels
4
32khz Rtc
No
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AT90USB82-16MU
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
4.6.1.4
4.7
10
Reading the Flash or EEPROM Data
Answers from Bootloader
SETUP
OUT
OUT
OUT
OUT
IN
Figure 4-1.
The Host sends a DFU_DNLOAD request with Zero Length Packet (ZLP) to indicate that it has
completed transferring the firmware image file. This is the final payload packet of a download
operation.
After each program request, the Host can request the device state and status by sending a
DFU_GETSTATUS message.
If the device status indicates an error, the host must send a DFU_CLRSTATUS request to the
device.
The flow described below allows the user to read data in the Flash memory or in the EEPROM
data memory. A blank check command on the Flash memory is possible with this flow.
This operation is performed in 2 steps:
• DFU_DNLOAD request with the read command (6 bytes)
• DFU_UPLOAD request which correspond to the previous command.
Example of Firmware Download Zero Length DFU_DNLOAD Request
DFU_DNLOAD
Prog_Start + (EP0 fifo length - 6) x 00h
X offset bytes + Firmware Packet 1
Firmware Packet 2
Firmware Packet n + DFU suffix
ZLP
7618C–AVR–07/08