I am unable to access the extended command set. I am attempting to read the control status flags, and I always get 0xff00 after a power-on-reset. If I set a 16-bit value into the “atrate”, I get a control status value whose low byte is the high byte of the atrate value most recently written. I have modified my I2C driver code to conform to document SLUA467A, but I am unable to correctly access the extended commands as documented. Please help.