4.3.2. Multiplexed trace port (ETMv1.x and ETMv2.x only)

You can implement a narrow (multiplexed) trace port where it is important to reduce the number of output pins to a minimum. You can achieve this by clocking the trace port at twice the processor operating frequency and routing pairs of trace port outputs to a single output pin. Use the PORTMODE signals to select multiplexed trace port operation, see Main Control Register, ETMCR. For implementation details, see the appropriate ETM Technical Reference Manual.

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