SCM System I~2C Bus and SPI Interface Multiplexing Method Research

Aiming at the design of SCM system hardware without serial synchronous bus hardware interface,proposed and realized the I2C(Inter-Integrated Circuit) and SPI(Serial Peripheral Interface) expansion and multiplexing method.Using software method to simulate the serial synchronous bus timing,SCM system design of the I2C bus peripheral interface PCF8583 and the SPI peripheral interface MAX7219 multiplexing method,effectively solve the I/O resources shortage.System operation results show that different serial synchronous bus multiplexing method,not only in theory is feasible but the peripheral operation also stable and reliable,provides a good solution for the synchronous serial bus expansion problem.