Hi Marc,
The screen shot did not make it through, but yes - the RD input activates the write sequence (assuming that /CS is low) on the ADS7263. Also yes - all bits in the control register would be updated. The MSB is going to be valid with the first falling SCLK edge after the RD is clocked into the device, MSB first through 14-bits and then zeros at the end of the transfer.