AT89C5131A-L Atmel Corporation, AT89C5131A-L Datasheet - Page 19

• Manufacturer Part Number: AT89C5131A-L
• Manufacturer: Atmel Corporation

Specifications of AT89C5131A-L

• Flash (kbytes): 32 Kbytes
• Max. Operating Frequency: 48 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Sram (kbytes): 1.25
• Eeprom (bytes): 1024
• Self Program Memory: API
• Operating Voltage (vcc): 3.0 to 3.6
• Timers: 4
• Isp: UART/USB
• Watchdog: Yes

Figure 7. Example of Firmware Download Zero Length DFU_DNLOAD Request
Answers from
Bootloader
4287E–USB–04/08
SETUP
OUT
OUT
OUT
OUT
IN
The Host sends a DFU_DNLOAD request with the wLength field cleared to 0 to the device to
indicate that it has completed transferring the firmware image file. This is the final payload
packet of a download operation.
This operation should be preceded by a Long Jump address specification using the correspond-
ing Flash command.
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 can send a DFU_CLRSTATUS request to the
device.
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
AT89C5131A USB Bootloader
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