AT89C51CC02UA-RATUM Atmel, AT89C51CC02UA-RATUM Datasheet - Page 80

IC 8051 MCU 16K FLASH 32-VQFP

AT89C51CC02UA-RATUM

Manufacturer Part Number
AT89C51CC02UA-RATUM
Description
IC 8051 MCU 16K FLASH 32-VQFP
Manufacturer
Atmel
Series
AT89C CANr
Datasheet

Specifications of AT89C51CC02UA-RATUM

Core Processor
8051
Core Size
8-Bit
Speed
40MHz
Connectivity
CAN, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
20
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
512 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
32-TQFP, 32-VQFP
Processor Series
AT89x
Core
8051
Data Bus Width
8 bit
Data Ram Size
512 B
Interface Type
UART
Maximum Clock Frequency
40 MHz
Number Of Programmable I/os
20
Number Of Timers
1
Operating Supply Voltage
3 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
CANADAPT28
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 8 Channel
For Use With
AT89OCD-01 - USB EMULATOR FOR AT8XC51 MCU
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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Working on Message Objects
CAN Controller
Management
80
AT/T89C51CC02
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.
In order to enable the CAN Controller correctly the following registers have to be
initialized:
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:
This configuration is made in the CONCH field of the CANCONCH register (See
Table 54).
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
General Control (CANGCON),
bit Timing (CANBT 1, 2 & 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
4126L–CAN–01/08

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