c51中P2是什么意思
时间: 2023-09-15 12:19:56 浏览: 64
在C51单片机中,P2是指并行口2。C51系列单片机有4个并行口(P0, P1, P2, P3),其中P2是其中一个并行口的引脚。然而,对于复杂的应用系统来说,真正可供用户使用的并行口只有P1口。并且,常常因为扩展I2C和SPI的器件需占用某些P1口,迫使用户无法直接使用P2口。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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