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CAN protocol imposes rather stringent requirements on its timing source, which are generally met by the provision of an external quartz crystal/oscillator. The TMS320C2803x/TMS320F2806x series of microcontrollers have an on-chip zero-pin oscillator that needs no external components. This application report describes how to use the CAN module with this oscillator to operate at the maximum bit rate and bus length without the added cost of an external clock source. The experimental setup was tested over the entire operating temperature range of the device.