引脚数 meaning in English

lead count
pin count

Comparing with the traditional parallel interface chips , they have fewer legs ~ smaller volume and use fewer resources . therefore , multiple channel data selecting controls keyboar & . display and alarm are realized through at89c52 ? four eight - bit i / o interface , without extending other i / o interface , making the system simplified and reliability increased
单片机的i / o接口芯片全部采用最新的串行工作方式接口芯片，与传统的并行接口芯片相比，它们引脚数少，体积小，占用的口资源少，因此用at89c52的4个8位的i / o口就完成了多个通道的数据采集、控制、键盘、显示和报警等功能，没有扩展其它i / o接口，使系统接线简化，可靠性提高。