详细描述SPI发送和接收过程，已经经过调试通过，主要适用于PIC18F-A detailed descr iption of the process of sending and receiving SPI, debugging has been approved, mainly applicable to PIC18FXXX

This file is a guide on the test cases for CLASSB self testing, the way it needs to be run and settings required for them. The self test was performed on 18F4620 and 18F45J10 devices and tested.