AT89C5131A View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89C5131A

USB Microcontrollers

Atmel Corporation 

AT89C5131A USB Bootloader

Answers from the

Device to a Blank Check

Command

The Host controller send a GET_STATUS request to the device. Once internal blank check has

been completed, the device sends its status.

• If the device status is “OK”:

the device memory is then blank and the device waits the next Host request.

• If the device status is “errCHECK_ERASED”:

the device memory is not blank. The device waits for an DFU_UPLOAD request to send the

first address where the byte is not 0xFF.

Programming

Configuration

Information

The flow described below allows the user to program Configuration Information regarding the

bootloader functionality.

• Boot Process Configuration:

– BSB

– SBV

– P1_CF, P3_CF and P4_CF

– Fuse bits (BLJB, X2 and OSCON bits) (see section “Mapping and Default Value of

Hardware Security Byte”)

Take care that the Program Fuse bit command programs the 4 Fuse bits at the same time.

Request from Host

To start the programming operation, the Host sends DFU_DNLOAD request with the Write com-

mand in the data field (6 bytes).

SETUP

DFU_DNLOAD

OUT

IN

Write_command (6 bytes)

ZLP

Answers From

Bootloader

Command

Identifier

data[0]

01h

Id_write_command

04h

data[1]

00h

01h

02h

03h

04h

05h

06h

02h

00h

data[2]

Value

Value

data[3]

data[4]

Description

Write value in BSB

Write value in SBV

Write P1_CF

Write P3_CF

Write P4_CF

Write value in SSB

Write value in EB

Write value in Fuse

(HSB)

The device has two possible answers to a DFU_GETSTATUS request:

• If the chip is protected from program access, a “err_WRITE” status is returned to the Host.

• Otherwise, the device status is “OK“.

21

4287E–USB–04/08

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