AT89C51CC03 Atmel Corporation, AT89C51CC03 Datasheet - Page 8

• Manufacturer Part Number: AT89C51CC03
• Manufacturer: Atmel Corporation

Specifications of AT89C51CC03

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 40 MHz
• Cpu: 8051-12C
• Max I/o Pins: 37
• Spi: 1
• Uart: 1
• Can: 1
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 62.5
• Sram (kbytes): 2.25
• Eeprom (bytes): 2048
• Self Program Memory: API
• Operating Voltage (vcc): 3.0 to 5.5
• Timers: 4
• Isp: UART/CAN
• Watchdog: Yes

Physical Layer
CAN Controller
Initialization
8
AT89C51CC03 CAN Bootloader
The CAN is used to transmit information has the following configuration:
•
•
•
Two ways are possible to initialize the CAN controller:
•
•
The selection between these two solutions is made with EB:
•
•
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
Standard Frame CAN format 2.0A (identifier 11-bit)
Frame: Data Frame
Baud rate: autobaud is performed by the bootloader
Use the software autobaud
Use the user configuration stored in the CANBT1, CANBT2 and CANBT3
EB = FFh: the autobaud is performed.
EB not equal to FFh: the CANBT1:2:3 are used.
Read CANBT1 value
Read CANBT2 value
Read CANBT3 value
Configure the CAN
CANBTx = FFh
CAN controller
Initialization
CAN macro
CAN Error
EB = FFh
Initialized
controller
x=(1,3)
No
No
No
Yes
Yes
Yes
Yes
Set the CAN controller in
autobaud mode
Autobaud ok
No
4251B–CAN–03/08