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This DCO calibrator starts with me not having a crystal on my board, and stealing rick's idea about using the UART to calibrate the DCO. It works without the UART peripheral or capture compare. The host sends the 'U' character and the micro responds with what adjustment it made, or that it calibrated to the target frequency. When the micro is calibrated, it sends the calibration constant values to the host, which prints them for the user. I used an oscope to verify the frequency on the P1.4's SMCLK output. Code is here: https://github.com/analog10/UART_DCO_Calibrator rick's original c