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AD9914 LSB/MSB mode

Question asked by tnagy14 on Jun 3, 2013
Latest reply on Jun 5, 2013 by tnagy14

I am attempting to setup the AD9914 eval board for LSB first mode.  It seems easy enough to write bit 0 of CFR 0 high as the datasheet indicates but it does not seem to be working.  I write (MSB mode from Arduino) to CFR 0 and issue IO_UPDATE then switch the arduino to LSB mode and continue to write the remaining registers and frequency tuning word.  I do not get any output.  As a test, I kept the arduino on MSB mode the whole time and it works. Basically,  It is still capable of reading the data in MSB mode even though it should be in LSB mode.  Any suggestions?

 

Thanks a lot

 

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