STC51单片机 CH340下载电路

STC51单片机的CH340下载电路是通过将CH340G的TXD引脚连接到单片机的RXD引脚，并将CH340G的RXD引脚连接到单片机的TXD引脚实现的。此外，CH340G的供电方式要根据具体情况来确定，如果使用5V供电，则不需要额外的操作，如果使用3.3V供电，则需要将第4脚连接到3.3V。下载程序时，STC51单片机需要断电再重新上电以完成下载过程。在整个电路图中，只有一个芯片CH340，所以我们首先需要参考CH340的数据手册来了解它所需的引脚功能。然后，根据数据手册中的引脚连接信息，将其与STC51单片机的引脚进行连接。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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