3.3 Other Configuration
- Implement USART DRE Interrupt Service
                                        Routine.Manchester data is entered to the USART TXDATA register here. 
- Set CCL pin.Set the CCL LUT-OUT pin as an output in the I/O PORT register. 
Manchester data is entered to the USART TXDATA register here.
Set the CCL LUT-OUT pin as an output in the I/O PORT register.