CTS_N_K
settings->cts_n = CTS_N_M(3) | CTS_N_K(0);
settings->cts_n = CTS_N_M(3) | CTS_N_K(1);
settings->cts_n = CTS_N_M(3) | CTS_N_K(2);
settings->cts_n = CTS_N_M(3) | CTS_N_K(3);
settings->cts_n = CTS_N_M(0) | CTS_N_K(0);