I am facing a problem regarding writing a value to a certain register in AD7293 evaluation board.
In the configuration page (0x02), for the address 0x23 which is the register regarding background monitoring of some certain values, as much as try I cannnot enable background conversions for RSx+mon values which are bits D8-D11.
I write 1 to the corresponding bits (1111) but when I re-read this very register only the bit associated to RS3+mon is enables and the rest get disable again! (1111 turn to 1000).
and I tried by different combination of values intending to enable some RSx+ pin and each time also the reserved value (bit D12-D15) changes from 0 to different values, and again bits related to RSx+ turn to 0.
I also tried to figure out if it is a protection mechanism and some other registers need to be configured before enabling the RSx+, but throughout datasheet I couldn't find anything.
I would appreciate if someone can help me.
Thanks in advance.