IF_FREQUENCYx6
op->frequency = (500 * (div - IF_FREQUENCYx6)) / 3 * 1000;
div = (((c->frequency + 83333) * 3) / 500000) + IF_FREQUENCYx6;
div = (((c->frequency + 83333) * 3) / 500000) + IF_FREQUENCYx6;
div = (((c->frequency + 83333) * 3) / 500000) + IF_FREQUENCYx6;