AT89C51CC03 データシートの表示（PDF） - Unspecified

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AT89C51CC03

CAN Microcontrollers

Unspecified 

Physical Layer

CAN Controller

Initialization

The CAN is used to transmit information has the following configuration:

• Standard Frame CAN format 2.0A (identifier 11-bit)

• Frame: Data Frame

• Baud rate: autobaud is performed by the bootloader

Two ways are possible to initialize the CAN controller:

• Use the software autobaud

• Use the user configuration stored in the CANBT1, CANBT2 and CANBT3

The selection between these two solutions is made with EB:

• EB = FFh: the autobaud is performed.

• EB not equal to FFh: the CANBT1:2:3 are used.

CANBT1:3 and EB can be modified by user through a set of API or with ISP commands.

The figure below describes the CAN controller flow.

Figure 2. CAN Controller Initialization

CAN controller

Initialization

Yes

EB = FFh

No

Read CANBT1 value

Read CANBT2 value

Read CANBT3 value

CANBTx = FFh

Yes

x=(1,3)

No

Configure the CAN

controller

CAN Error

No

Yes

Set the CAN controller in

autobaud mode

Yes

CAN macro

Initialized

No

Autobaud ok

8 AT89C51CC03 CAN Bootloader

4251B–CAN–03/08

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