20.2 Receive Mode

The module can be configured for receive operation by setting the RCVEN (SENTxCON1[11]) bit. The time between each falling edge is compared to SYNCMIN[15:0] (SENTxCON3[15:0]) and SYNCMAX[15:0] (SENTxCON2[15:0]), and if the measured time lies between the minimum and maximum limits, the module begins to receive data. The validated Sync time is captured in the SENTxSYNC register and the tick time is calculated. Subsequent falling edges are verified to be within the valid data width and the data are stored in the SENTxDATL/H registers. An interrupt event is generated at the completion of the message and the user software should read the SENTx Data registers before the reception of the next nibble. The equation for SYNCMIN[15:0] and SYNCMAX[15:0] is shown in Equation 20-3.

Equation 20-3. SYNCMIN[15:0] and SYNCMAX[15:0] Calculations

For T_TICK = 3.0 µs and F_CLK = 4 MHz, SYNCMIN[15:0] = 76.

Note: To ensure a Sync period can be identified, the value written to SYNCMIN[15:0] must be less than the value written to SYNCMAX[15:0].