19 Controller Area Network (CAN) Module
Controller Area Network (CAN) is a multicast, shared serial bus standard for connecting electronic
control units (ECUs). CAN was specifically designed to be robust in electromagnetically-noisy
environments and can utilize a differential balanced line like RS-485 or a more robust twisted-pair
wire. Originally created for automotive purposes, it is also used in many embedded control
applications (such as industrial and medical). Bit rates up to 1 Mbps are possible at network lengths
less than 40 meters. Decreased bit rates allow longer network distances (for example, 125 Kbps at
500 meters).
The TM4C1294NCPDT microcontroller includes two CAN units with the following features:
■ CAN protocol version 2.0 part A/B
■ Bit rates up to 1 Mbps
■ 32 message objects with individual identifier masks
■ Maskable interrupt
■ Disable Automatic Retransmission mode for Time-Triggered CAN (TTCAN) applications
■ Programmable loopback mode for self-test operation
■ Programmable FIFO mode enables storage of multiple message objects
■ Gluelessly attaches to an external CAN transceiver through the CANnTX and CANnRX signals
June 18, 20141356
Texas Instruments-Production Data
Controller Area Network (CAN) Module
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