57.7.9.6.3 Collision Detection

As an option of the CEA-709 standard collision detection is supported through an active low Collision Detect (CD) input from the transceiver.

The Collision Detection source can be either external (see I/O Lines Description) or internal. The collision detection source selection is defined through the LCDS bit in the USART LON Mode register (FLEX_US_LONMR).

The Collision Detection feature can be activated through the COLDET bit of the USART LON Mode register. If the collision detection feature is enabled and CD signal goes low for at least half t_bit period then a collision is detected and reported as defined in comm_type.