SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
Four output functions are available for the CAN transmit pin CAN_TX. In addition to its default function (serial data output), the CAN_TX pin can drive constant dominant or recessive values, or it can drive the CAN sample point signal to monitor the CAN core’s bit timing.
Combined with the readable value of the CAN_RX pin, this function can be used to check the physical layer of the CAN bus.
The output mode of pin CAN_TX is selected by programming the DCAN_TEST[6:5] TX:
The software control for the CAN_TX pin interferes with CAN protocol functions. For CAN message transfer or any of the test modes (loopback mode, external loopback mode or silent mode), the CAN_TX pin should operate in its default functionality.