Datasheet

DCAN

CAN_TX

CAN Core

Rx Tx

CAN_RX

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Test Modes

26.14.3 External Loop Back Mode

The External Loop Back Mode is similar to the Loop Back Mode, however it includes the signal path from

CAN Core to Tx pin, the Tx pin itself, and the signal path from Tx pin back to CAN Core. When External

Loop Back Mode is selected, the input of the CAN core is connected to the input buffer of the Tx pin.

With this configuration, the Tx pin IO circuit can be tested.

External Loop Back Mode can be activated by setting bit ExL in Test Register to 1.

Figure 26-18 shows the connection of signals CAN_TX and CAN_RX to the CAN Core in External Loop

Back Mode.

NOTE: When Loop Back Mode is active (LBack bit set), the ExL bit will be ignored.

Figure 26-18. CAN Core in External Loop Back Mode

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SPNU562–May 2014 Controller Area Network (DCAN) Module

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