摘要
74HC595A芯片具有串行输入、并行输出功能,利用该集成电路可设计多位LED(发光二极管)串行显示电路。文中介绍了利用该芯片设计的12位LED串行显示电路,详细说明了该电路的工作原理及编程思路,并给出了参考程序。该电路只占用单片机3根口线,较并行显示方式极大地节省了系统资源,已在实际系统中得到应用。
The chip of 74HC595A has functions of serial input and parallel output, so we could design a circuit for multi-bit LED display by making use of this integrated circuit. This paper introduces 12 bit LED serial display circuit designed by making use of the chips. Then it illustrates the operation principle of the circuit in detail and presents the referenced program. Using 3 pins of the MCU only, the circuit saves the system resource compared with parallel display method. It has been applied to practical systems.
出处
《电子工程师》
2006年第2期47-49,52,共4页
Electronic Engineer
