Atmel Evaluation Kit AT91SAM9X25-EK AT91SAM9X25-EK Scheda Tecnica
Codici prodotto
AT91SAM9X25-EK
897
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
41.
Controller Area Network (CAN) Programmer Datasheet
41.1 Description
The CAN controller provides all the features required to implement the serial communication protocol CAN defined by
Robert Bosch GmbH, the CAN specification as referred to by ISO/11898A (2.0 Part A and 2.0 Part B) for high speeds
and ISO/11519-2 for low speeds. The CAN Controller is able to handle all types of frames (Data, Remote, Error and
Overload) and achieves a bitrate of 1 Mbit/sec.
Robert Bosch GmbH, the CAN specification as referred to by ISO/11898A (2.0 Part A and 2.0 Part B) for high speeds
and ISO/11519-2 for low speeds. The CAN Controller is able to handle all types of frames (Data, Remote, Error and
Overload) and achieves a bitrate of 1 Mbit/sec.
CAN controller accesses are made through configuration registers. 8 independent message objects (mailboxes) are
implemented.
implemented.
Any mailbox can be programmed as a reception buffer block (even non-consecutive buffers). For the reception of defined
messages, one or several message objects can be masked without participating in the buffer feature. An interrupt is
generated when the buffer is full. According to the mailbox configuration, the first message received can be locked in the
CAN controller registers until the application acknowledges it, or this message can be discarded by new received
messages.
messages, one or several message objects can be masked without participating in the buffer feature. An interrupt is
generated when the buffer is full. According to the mailbox configuration, the first message received can be locked in the
CAN controller registers until the application acknowledges it, or this message can be discarded by new received
messages.
Any mailbox can be programmed for transmission. Several transmission mailboxes can be enabled in the same time. A
priority can be defined for each mailbox independently.
priority can be defined for each mailbox independently.
An internal 16-bit timer is used to stamp each received and sent message. This timer starts counting as soon as the CAN
controller is enabled. This counter can be reset by the application or automatically after a reception in the last mailbox in
Time Triggered Mode.
controller is enabled. This counter can be reset by the application or automatically after a reception in the last mailbox in
Time Triggered Mode.
The CAN controller offers optimized features to support the Time Triggered Communication (TTC) protocol.
41.2 Embedded Characteristics
Fully Compliant with CAN 2.0 Part A and 2.0 Part B
Bit Rates up to 1Mbit/s
8 Object Oriented Mailboxes with the Following Properties:
CAN Specification 2.0 Part A or 2.0 Part B Programmable for Each Message
Object Configurable in Receive (with Overwrite or Not) or Transmit Modes
Independent 29-bit Identifier and Mask Defined for Each Mailbox
32-bit Access to Data Registers for Each Mailbox Data Object
Uses a 16-bit Timestamp on Receive and Transmit Messages
Hardware Concatenation of ID Masked Bitfields To Speed Up Family ID Processing
16-bit Internal Timer for Timestamping and Network Synchronization
Programmable Reception Buffer Length up to 8 Mailbox Objects
Priority Management between Transmission Mailboxes
Autobaud and Listening Mode
Low Power Mode and Programmable Wake-up on Bus Activity or by the Application
Data, Remote, Error and Overload Frame Handling
Write Protected Registers