Rainbow-electronics AT89C5132 Manual do Utilizador descarregar pdf (Página 19)

AT89C5132

4256A–USB–06/03

Programming

Configuration

Information

The flow described below allows the user to program Configuration Information regard-

ing the bootloader functionality.

• Boot Process Configuration:

–BSB

–SBV

– Fuse bits (BLJB, X2) (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 command 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

ZLP

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 30 31

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