RTC_STATUS
i2c_tp->i2c_wbuf[0] = (uchar_t)RTC_STATUS; /* Read Status register */
i2c_tp->i2c_wbuf[0] = RTC_STATUS;
i2c_tp->i2c_wbuf[0] = (uchar_t)RTC_STATUS; /* Read Status register */
i2c_tp->i2c_wbuf[0] = (uchar_t)RTC_STATUS; /* Write Status register */