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AD9858  SPI LSB  MSB

Question asked by bill1989914 on May 1, 2017
Latest reply on May 9, 2017 by LouijieC

I am setting AD9858 DDS using serial interface. SIP.   

I feel confused about the Control function  register (CFR)' s  LSB bit 0:  [0];  address 0x00,  CFR[0]

The default value is 0, which meas MSB first out , I think.

 

BUT I need to sent the data like  [31:24 ] , [23:16], [15:8],[7:0]   (0x00, 0x00, 0x00, 0x18)

or  [7:0], [15:8],[23:16],[31:24]  (0x18,0x00,0x00,0x00) ???

 

also , if the LSB bit is set to 1 ,

How to send the address byte?  

 

I think it is very important for the configuration of  SPI.

 

 

Thank you

 

 

 

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