Introduction - If you have any usage issues, please Google them yourself
Application of a single-chip hardware circuit design contains two parts: First, expanding the system, namely, the internal single-chip functional unit, such as ROM, RAM, I/O, timer/counter, interrupt system can not meet the application system the request must be in the chip to expand, select the appropriate chip, the design of the corresponding circuit. Second, system configuration, that is, the functional requirements of system configuration in accordance with peripherals such as keyboards, monitors, printers, A/D, D/A converters and so on, to design a suitable interface circuit.