at89c5131a ATMEL Corporation, at89c5131a Datasheet - Page 19

• Manufacturer Part Number: at89c5131a
• Description: Usb Microcontrollers
• Manufacturer: ATMEL Corporation

Reading the Flash or
EEPROM Data
First Request from Host
Second Request from Host
Answers from the Device
4287C–USB–11/04
OUT
SETUP
IN
IN
IN
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:
1. DFU_DNLOAD request with the read command (6 bytes)
2. DFU_UPLOAD request which correspond to the immediate previous command.
The Host sends a DFU Download request with a Display command in the data field.
The Host sends a DFU Upload request.
The device send to the Host the firmware from the specified start address to the end
address.
Id_display_data
Command
Identifier
ZLP
DFU_UPLOAD
Firmware Packet 1
Firmware Packet 2
Firmware Packet n
03h
SETUP
OUT
IN
data[0]
00h
01h
02h
data[1]
AT89C5131A USB Bootloader
start_address
data[2]
DFU_DNLOAD
Display_Data (6 bytes)
ZLP
data[3]
end_address
data[4]
Display EEPROM Data
Blank Check in FLASH
Display FLASH Data
Description
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