27.3.1.4 Synchronous Master Transmission Setup
- Initialize the SPxBRGH, SPxBRGL register pair and the BRG16 bit to achieve the desired baud rate (see EUSART Baud Rate Generator (BRG)).
- Select the transmit output pin by writing the appropriate values to the RxyPPS register and RXxPPS register. Both selections should enable the same pin.
- Select the clock output pin by writing the appropriate values to the RxyPPS register and CKxPPS register. Both selections should enable the same pin.
- Enable the synchronous master serial port by setting bits SYNC, SPEN and CSRC.
- Disable Receive mode by clearing bits SREN and CREN.
- Enable Transmit mode by setting the TXEN bit.
- If 9-bit transmission is desired, set the TX9 bit.
- If interrupts are desired, set the TXxIE bit of the PIEx register and the GIE and PEIE bits of the INTCON register.
- If 9-bit transmission is selected, the ninth bit should be loaded in the TX9D bit.
- Start transmission by loading data to the TXxREG register.