18

7618C–AVR–07/08

8.

Bootloader History

The following table shows the different bootloader revision and associated changes.

Table 8-1.

USB Bootloader History

9.

Appendix-A

Product

Bootloader Revision

Changes

AT90USB1287

AT90USB1286

AT90USB647

AT90USB646

1.0.1

Initial Revision

AT90USB162

AT90USB82

1.0.0

Initial Revision

1.0.1

Allow to use 16MHz cristal with 3.3V power supply and

CKDIV8 fuse.

1.0.5

Improved USB autobaud process

ATmega32U4

ATmega16U4

1.0.0

Initial Revision

Table 9-1.

Summary of Frames from Host

Command Identifier

data[0]

data[1]

data[2]

data[3]

data[4]

Description

Id_prog_start

01h

00h

start_address

end_address

Init FLASH programming

01h

Init EEPROM programming

Id_display_data

03h

00h

start_address

end_address

Display FLASH Data

01h

Blank Check in FLASH

02h

Display EEPROM Data

Id_write_command

04h

00h

FFh

Full chip Erase (bits at FFh)

03h

00h

Hardware reset

01h

address

LJMP address

Id_read_command

05h

00h

00h

Read Bootloader Version

01h

Read Device boot ID1

02h

Read Device boot ID2

01h

30h

Read Manufacturer Code

31h

Read Family Code

60h

Read Product Name

61h

Read Product Revision

Id_change _base

_address

06h

03h

00

“PP”

Select “PP” 64kBytes flash

page number