参数资料
型号: T89C51CC02UA-TDSIM
厂商: Atmel
文件页数: 139/159页
文件大小: 0K
描述: IC 8051 MCU FLASH 16K 24-SOIC
标准包装: 31
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: 24-SOIC(0.295",7.50mm 宽)
包装: 管件
配用: AT89STK-06-ND - KIT DEMOBOARD 8051 MCU W/CAN
其它名称: T89C51CC02UATDSIM
80
AT/T89C51CC02
4126L–CAN–01/08
Working on Message Objects
The Page message object register (CANPAGE) is used to select one of the 4 message
objects. Then, message object Control (CANCONCH) and message object Status
(CANSTCH) are available for this selected message object number in the corresponding
SFRs. A single register (CANMSG) is used for the message. The mailbox pointer is
managed by the Page message object register with an auto-incrementation at the end of
each access. The range of this counter is 8.
Note that the maibox is a pure RAM, dedicated to one message object, without overlap.
In most cases, it is not necessary to transfer the received message into the standard
memory. The message to be transmitted can be built directly in the maibox. Most calcu-
lations or tests can be executed in the mailbox area which provide quicker access.
CAN Controller
Management
In order to enable the CAN Controller correctly the following registers have to be
initialized:
General Control (CANGCON),
bit Timing (CANBT 1, 2 & 3),
And for each page of 15 message objects:
Message object Control (CANCONCH),
Message object Status (CANSTCH).
During operation, the CAN Enable message object registers (CANEN) gives a fast over-
view of the message objects availability.
The CAN messages can be handled by interrupt or polling modes.
A message object can be configured as follows:
Transmit message object
Receive message object
Receive buffer message object
Disable
This configuration is made in the CONCH field of the CANCONCH register (See
When a message object is configured, the corresponding ENCH bit of CANEN register
is set.
Table 54. Configuration for CONCH1:2
When a Transmitter or Receiver action of a message object is completed, the corre-
sponding ENCH bit of the CANEN register is cleared. In order to re-enable the message
object, it is necessary to re-write the configuration in CANCONCH register.
Non-consecutive message objects can be used for all three types of message objects
(Transmitter, Receiver and Receiver buffer).
CONCH 1
CONCH 2
Type of Message Object
0
Disable
0
1
Transmitter
10
Receiver
1
Receiver buffer
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