SPI：Serial Perripheral Interface，串行外围设备接口，由 Motorola 公司提出，是一种高速、全双工、同步通信总线。SPI 以主从方式工作，通常是有一个主设备和一个或多个从设备，无应答机制。 本文我们讲解标准的 4 线 SPI，四根线如下： ①、CS/SS，Slave Select/Chip Select ...

SPI is a very useful and flexible standard, but its flexibility stems from its simplicity. Four channels of unidirectional moderate speed isolation will handle SPI to clock rates of a couple of MHz.