描述
利用输出点扩展输出点与利用输出点扩展输入点相似，也可以用输出点分时控制一组输出点的输出内容。例如：在输出端口上接有多位LED7段码显示器时，如果采用直接连接，所需的输出点是很多的。这时可使用图9的电路利用输出点的分时接通逐个点亮多位LED7段码显示器。
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