参数资料
型号: AT89C51CC02UA-SISUM
厂商: Atmel
文件页数: 131/159页
文件大小: 0K
描述: IC 8051 MCU 16K FLASH 28-PLCC
产品培训模块: MCU Product Line Introduction
标准包装: 888
系列: AT89C CAN
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: CAN,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 20
程序存储器容量: 16KB(16K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 512 x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 28-PLCC
包装: 管件
产品目录页面: 616 (CN2011-ZH PDF)
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
73
AT/T89C51CC02
4126L–CAN–01/08
CAN Controller
The CAN Controller provides all the features required to implement the serial communi-
cation protocol CAN as defined by BOSCH GmbH. The CAN specification as referred to
by ISO/11898 (2.0A & 2.0B) for high speed and ISO/11519-2 for low speed. The CAN
Controller is able to handle all types of frames (Data, Remote, Error and Overload) and
achieves a bitrate of 1-Mbit/s at 8 MHz
1 Crystal frequency in X2 Mode.
Note:
1. At BRP = 1 sampling point will be fixed.
CAN Protocol
The CAN protocol is an international standard defined in the ISO 11898 for high speed
and ISO 11519-2 for low speed.
Principles
CAN is based on a broadcast communication mechanism. This broadcast communica-
tion is achieved by using a message oriented transmission protocol. These messages
are identified by using a message identifier. Such a message identifier has to be unique
within the whole network and it defines not only the content but also the priority of the
message.
The priority at which a message is transmitted compared to another less urgent mes-
sage is specified by the identifier of each message. The priorities are laid down during
system design in the form of corresponding binary values and cannot be changed
dynamically. The identifier with the lowest binary number has the highest priority.
Bus access conflicts are resolved by bit-wise arbitration on the identifiers involved by
each node observing the bus level bit for bit. This happens in accordance with the "wired
and" mechanism, by which the dominant state overwrites the recessive state. The com-
petition for bus allocation is lost by all nodes with recessive transmission and dominant
observation. All the "losers" automatically become receivers of the message with the
highest priority and do not re-attempt transmission until the bus is available again.
Message Formats
The CAN protocol supports two message frame formats, the only essential difference
being in the length of the identifier. The CAN standard frame, also known as CAN 2.0 A,
supports a length of 11 bits for the identifier, and the CAN extended frame, also known
as CAN 2.0 B, supports a length of 29 bits for the identifier.
Can Standard Frame
Figure 32. CAN Standard Frames
A message in the CAN standard frame format begins with the "Start Of Frame (SOF)",
this is followed by the "Arbitration field" which consist of the identifier and the "Remote
Transmission Request (RTR)" bit used to distinguish between the data frame and the
data request frame called remote frame. The following "Control field" contains the "IDen-
tifier Extension (IDE)" bit and the "Data Length Code (DLC)" used to indicate the
11-bit identifier
ID10..0
Interframe
Space
4-bit DLC
DLC4..0
CRC
del.
ACK
del.
15-bit CRC
0 - 8 bytes
SOF
RTR IDE
r0
ACK
7 bits
Intermission
3 bits
Bus Idle
(Indefinite)
Arbitration
Field
Data
Field
Data Frame
Control
Field
End of
Frame
CRC
Field
ACK
Field
Interframe
Space
11-bit identifier
ID10..0
Interframe
Space
4-bit DLC
DLC4..0
CRC
del.
ACK
del.
15-bit CRC
SOF
RTR IDE
r0
ACK
7 bits
Intermission
3 bits
Bus Idle
(Indefinite)
Arbitration
Field
Remote Frame
Control
Field
End of
Frame
CRC
Field
ACK
Field
Interframe
Space
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