本书详细介绍了单片机实用接口子程序，并给出了c语言程序。接口类型有RS232、RS485、CAN总线、I2C总线、SPI总线、键盘接口等-This book details the practical interface subroutine SCM, and gives the c language program. Interface types are RS232, RS485, CAN bus, I2C bus, SPI bus, keyboard interface