AT89C51CC03 Просмотр технического описания (PDF) - Unspecified

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AT89C51CC03

CAN Microcontrollers

Unspecified 

Protocol

Generic CAN Frame

Description

Identifier

11-bit

Control

1 byte

Data

8 bytes max

• Identifier:

Identifier identifies the frame (or message). Only the standard mode (11-bit) is used.

• Control:

Control contains the DLC information (number of data in Data field) 4-bit.

• Data:

Data field consists of zero to eight bytes. The interpretation within the frame depends on the

Identifier field.

The CAN protocol manages directly using hardware a checksum and an acknowledge.

Note: To describe the ISP CAN Protocol, we use Symbolic name for Identifier, but default values are

given.

Command Description

This protocol allows to:

• Initiate the communication

• Program the Flash or EEPROM Data

• Read the Flash or EEPROM Data

• Program Configuration Information

• Read Configuration and Manufacturer Information

• Erase the Flash

• Start the application

Overview of the protocol is detailed in APPENDIX-1.

Several CAN message identifiers are defined to manage this protocol.

Identifier

ID_SELECT_NODE

ID_PROG_START

ID_PROG_DATA

ID_DISPLAY_DATA

ID_WRITE_COMMAND

ID_READ_COMMAND

ID_ERROR

Command Effect

Open/Close a communication with a node

Start a Flash/EEPROM programming

Data for Flash/EEPROM programming

Display data

Write in XAF, or Hardware Byte

Read from XAF or Hardware Byte and special data

Error message from bootloader only

Value

[CRIS]0h

[CRIS]1h

[CRIS]2h

[CRIS]3h

[CRIS]4h

[CRIS]5h

[CRIS]6h

It is possible to allocate a new value for CAN ISP identifiers by writing the byte CRIS with the

base value for the group of identifier.

The maximum value for CRIS is 7Fh and the default CRIS value is 00h.

10 AT89C51CC03 CAN Bootloader

4251B–CAN–03/08

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