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Using Stm32l476 controller. Master is running at 30 MHz and slave
is running 15 MHz. In SPI master clock should be system clock/2 slave
clock should be system clock/4 

 
Question 1: My understanding is slave need clock from master. Data
shifting completely</description><dc:language>en-US</dc:language><generator>Telligent Community 10</generator><item><title>RE: SPI clock selection</title><link>https://community.arm.com/thread/86462?ContentTypeID=1</link><pubDate>Mon, 28 Jan 2019 18:11:53 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:21d602a8-742d-4575-a8e7-c95d7883ae0a</guid><dc:creator>Westonsupermare Pier</dc:creator><description>&lt;p&gt;&lt;p&gt;
Master should determine SPI interface clock.&lt;/p&gt;
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