AT89C51CC03UA-RLTUM View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

AT89C51CC03UA-RLTUM

CAN Microcontrollers

Unspecified 

Example

AT89C51CC03 CAN Bootloader

Programming Data (write 55h from 0000h to 0008h in the flash)

identifier control

data

HOST

BOOTLOADER

Id_prog_start

Id_prog_start

05 00 00 00 00 08

00

HOST

BOOTLOADER

HOST

BOOTLOADER

Id_prog_data

Id_prog_data

Id_prog_data

Id_prog_data

08 55 55 55 55 55 55 55 55

01 02 // command_new_data

01 55

01 00 // command_ok

Programming Data (write 55h from 0000h to 0008h in the flash), with SSB i

identifier control

data

HOST

BOOTLOADER

Id_prog_start

Id_error

04 00 00 00 08

01 00 // error_security

Reading the Flash or

EEPROM Data

Requests from Host

Answers from

Bootloader

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 can be executed only with a device previously opened in communication.

To start the reading operation, the Host sends a “Display Data” CAN message (Id_display_data)

with the area memory selected, the start address and the end address passed in parameter.

The device splits into block of 8 bytes data to transfer to the Host if the number of data to display

is greater than 8 data bytes.

Note:

Identifier

Length data[0]

data[1]

data[2]

00h

ID_DISPLAY_DATA

5

01h

address_start

02h

1. Data[0] selects the area to read and the operation

- 00h: Display Flash

- 01h: Blank Check on the Flash

- 02h: Display EEPROM data

2. The address_start gives the start address to read.

3. The address_end gives the last address to read.

data[3]

data[4]

address_end

The device has two possible answers:

• If the chip is protected from read access a “Error” CAN message is sent (see Section “Error

Message Description”).

• Otherwise:

for a display command the device start to send the data up to 8 by frame to the host. for a

blank check command the device send a result ok or the first address not erased.

Answer to a read command:

Identifier

ID_DISPLAY_DATA

Length

n

data[n]

x

15

4251B–CAN–03/08

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