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Read HMC1197's registers but only get Reg 00h's value

Question asked by llccbb1 on Dec 17, 2017
Latest reply on Dec 18, 2017 by llccbb1

Hi,

I'm trying to communicate with HMC1197. I can read Reg00h's value(C7701A). But when I tried to read any other READ ONLY register, like Reg 07h, I got always C7701A.

Following ,is my scope screen-captures when i want to read Reg 07h

I think my SPI waveform is right. In the first cycle, SDI write 0111b(Reg 07h) at r3:r0. But SDO still C7701A.

And I have readhttps://ez.analog.com/message/162091?commentID=162091#comment-162091 

and https://ez.analog.com/message/287764?commentID=287764#comment-287764?q=hmc1190 .

But unfortunately, there are little help for me.

Could anybody help me? Thank you!dyoung1stanis

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