MCU概念
https://zhuanlan.zhihu.com/p/636395832
MCU、单片机、芯片三者有什么区别?
https://aistudy.baidu.com/okam/pages/article/index?articleId=20188545&ucid=n1DvP1c3nHf&categoryLv1=%E6%95%99%E8%82%B2%E5%9F%B9%E8%AE%AD&ch=54&srcid=10005
单片机、51、MCU、stm32的关系
https://blog.csdn.net/caishenbuaiwo/article/details/143817637
单片机自学路线
https://blog.csdn.net/chenby186119/article/details/144259463
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