AT89C5131A(2004) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89C5131A
(Rev.:2004)

USB Microcontrollers

Atmel Corporation 

Figure 6. Example of Firmware Download Zero Length DFU_DNLOAD Request

SETUP

DFU_DNLOAD

OUT

Prog_Start + (EP0 fifo length - 6) x 00h

OUT

X offset bytes + Firmware Packet 1

OUT

Firmware Packet 2

OUT

IN

Answers from Bootloader

Firmware Packet n + DFU suffix

ZLP

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 cor-

responding Flash command.

After each program request, the Host can request the device state and status by send-

ing a DFU_GETSTATUS message.

If the device status indicates an error, the host can send a DFU_CLRSTATUS request

to the device.

18 AT89C5131A USB Bootloader

4287C–USB–11/04

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