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How to implement LTC6820 as an communication interface between two microcontrollers

Category: Hardware
Product Number: LTC6820

Hi community.

I want to implement communication interface between two controllers. In the course of exploration I came to know about Iso-SPI. I want to know, how can we implement Iso-SPI between two controllers, where one controller is serving as a master and other as the slave? Is there any possibility to make both the controller as master? Also, how much noise immune it would be to implement on a system having very high EM Interference? 

Thanks for the support.