W7500 spi 최대클럭 문의
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RE: W7500 spi 최대클럭 문의
by justinkim ·
안녕하세요
W7500은 최대메인클럭이 48MHz이고 spi 최대클럭은 메인클럭의 절반인 24MHz입니다.
24MHz로 SPI가 동작하지만 좀더 안정적인 동작을 위해 20MHZ를 권장해 드리고 있습니다.
SPI 클럭을 만들수 있는 방법은 SPI클럭 = 메인클럭/(CPSDVSR*(1+SCR))의 공식으로 만들 수 있으며
CPSDVSR은 2-254까지 SCR은 0-255까지의 값을 설정 할 수 있습니다. 즉 최대 클럭은 CPSDVSR 값이 2이고 SCR이 0인 메인클럭/2값 입니다.
감사합니다.