29.1.1.1 Enabling the Transmitter
The EUSART transmitter is enabled for asynchronous operations by configuring the following three control bits:
- TXEN =
1
(enables the transmitter circuitry of the EUSART) - SYNC =
0
(configures the EUSART for asynchronous operation) - SPEN =
1
(enables the EUSART and automatically enables the output drivers for the RxyPPS selected as the TXx/CKx output)
All other EUSART control bits are assumed to be in their default state.
If the TXx/CKx pin is shared with an analog peripheral, the analog I/O function must be disabled by clearing the corresponding ANSEL bit.
Important: The TXxIF Transmitter Interrupt flag is set when
the TXEN enable bit is set and the TSR is idle.