20.1 Transmit Mode

By default, the SENTx module is configured for transmit operation. The module can be configured for continuous asynchronous message frame transmission, or alternatively, for Synchronous mode triggered by software. When enabled, the transmitter will send a Sync, followed by the appropriate number of data nibbles, an optional CRC and optional pause pulse. The tick period used by the SENTx transmitter is set by writing a value to the TICKTIME[15:0] (SENTxCON2[15:0]) bits. The tick period calculations are shown in Equation 20-1.

Equation 20-1. Tick Period Calculation

An optional pause pulse can be used in Asynchronous mode to provide a fixed message frame time period. The frame period used by the SENTx transmitter is set by writing a value to the FRAMETIME[15:0] (SENTxCON3[15:0]) bits. The formulas used to calculate the value of frame time are shown in Equation 20-2.

Equation 20-2. Frame Time Calculations

Note: The module will not produce a pause period with less than 12 ticks, regardless of the FRAMETIME[15:0] value. FRAMETIME[15:0] values beyond 2047 will have no effect on the length of a data frame.