Thanks CrossRoads,
I've read the article about CPOL and CPHA. Also, I want to ask you one more things,
What can i do if i want to measure the frequency and Vout?
From the spv1020 datasheet, i found the PWM frequency (default value) is 100kHz,
Is it relevant to the command list of the code 06- read PWM?
SPV1020 datasheet
http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/CD00275733.pdf