AT89C51CC03C-SLRIM Atmel, AT89C51CC03C-SLRIM Datasheet - Page 88
AT89C51CC03C-SLRIM
Manufacturer Part Number
AT89C51CC03C-SLRIM
Description
IC 8051 MCU FLASH 64K 44PLCC
Manufacturer
Atmel
Series
AT89C CANr
Datasheets
1.AT89C51CC03C-S3RIM.pdf
(198 pages)
2.AT89C51CC03C-S3RIM.pdf
(32 pages)
3.AT89C51CC03C-S3RIM.pdf
(27 pages)
4.AT89C51CC03C-S3RIM.pdf
(184 pages)
Specifications of AT89C51CC03C-SLRIM
Core Processor
8051
Core Size
8-Bit
Speed
40MHz
Connectivity
CAN, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
36
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
2.25K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
AT89C51CC03CSLRTR
Available stocks
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Working on Message Objects
CAN Controller
Management
88
AT89C51CC03
The Page message object register (CANPAGE) is used to select one of the 15 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.
In order to enable the CAN Controller correctly the following registers have to be
initialized:
•
•
•
During operation, the CAN Enable message object registers 1 and 2 (CANEN 1 and 2)
gives a fast overview of the message objects availability.
The CAN messages can be handled by interrupt or polling modes.
A message object can be configured as follows:
•
•
•
•
This configuration is made in the CONCH1:2 field of the CANCONCH register (see
Table 46).
When a message object is configured, the corresponding ENCH bit of CANEN 1 and 2
register is set.
Table 46. Configuration for CONCH1:2
When a Transmitter or Receiver action of a message object is completed, the corre-
sponding ENCH bit of the CANEN 1 and 2 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
General Control (CANGCON),
Bit Timing (CANBT 1, 2 and 3),
And for each page of 15 message objects
–
–
Transmit message object,
Receive message object,
Receive buffer message object.
Disable
0
0
1
1
message object Control (CANCONCH),
message object Status (CANSTCH).
CONCH 2
0
1
0
1
Type of Message Object
Disable
Transmitter
Receiver
Receiver buffer
4182E–CAN–05/04
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