SAM7X256_14 Datasheet, PDF (481/662 Pages) ATMEL Corporation – ARM-based Flash MCU

36. Controller Area Network (CAN)
36.1 Overview
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.
CAN controller accesses are made through configuration registers. 8 independent message objects (mailboxes) are
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.
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.
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.
The CAN controller offers optimized features to support the Time Triggered Communication (TTC) protocol.
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
481