buf[0] = ((divisor & 0x07f00) >> 8) & 0xff; // DB1
buf[1] = divisor & 0xff; // DB2
buf[2] = control_byte_1 (d_prescaler, d_reference_divider);
buf[0] = ((divisor & 0x07f00) >> 8) & 0xff; // DB1
buf[1] = divisor & 0xff; // DB2
buf[2] = control_byte_1 (d_prescaler, d_reference_divider);