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4256B–USB–03/06

AT89C5132

Programming

Configuration

Information

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

bootloader functionality.

•

Boot Process Configuration:

–

BSB

–

SBV

–

Fuse bits (BLJB, X2B) (see Section “Mapping and Default Value of Hardware

Security Byte”, page 3).

Ensure 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).

Answers from

Bootloader

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“.

Command Identifier

data[0]

data[1]

data[2]

data[3]

data[4]

Description

Id_write_command

04h

01h

00h

Value

Write value in BSB

01h

Write value in SBV

05h

Write value in SSB

06h

Write value in EB

02h

00h

Value

Write value in Fuse (HSB)

OUT

Write_command (6 bytes)

SETUP

DFU_DNLOAD

IN

ZLP