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STM32-GPIO模式+寄存器点灯
写单片机的东西,一定要记住,我们是在写驱动!不是应用层,和结构强相关。 引脚的两个保护二级管可以防止引脚外部过高或过低的电压输入,当引脚电压高于VDD 时,上方的二极管导通,当引脚电压低于VSS 时,下方的二极管导通,防止不正常电压引入芯片 ...
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