Hello,
I think there is a documentation bug in table 16-66 in the description of the PARITY_ENA field. It says initially that 5h will disable the parity check (this is the default value, so I am guessing this is correct), and all other values will enable parity checking. Then, there is a note that says "It is recommended to write a 5h to enable parity check, to guard against soft errors from flipping PARITY_ENA to a disabled state." I am guessing that should read "to write an Ah to enable...". Please correct me if I am incorrect. Thanks.