Study on Single-Chip Microcomputer Multi-port Serial Communication Based on Hardware Extension

There is one or two serial communication port in the single-chip microcomputer.However,multi-port serial communication is demanded in the reality of the engineering and scientific research.CD4052 analog multiplexers/de-multiplexers based on the principles of signal switching,SP2539 based on using six IO ports to select one of sub-serial port and reuse of an interrupt are used to extend single-chip microcomputer serial port.These two methods could achieve good effects in real circuit design.