51单片机引脚输出5v

根据引用\[2\]中的信息，51单片机的主电源引脚VCC(Pin40)是电源输入，接+5V电源。因此，51单片机的引脚输出是5V。
#### 引用[.reference_title]
- *1* *3* [C51单片机各引脚功能](https://blog.csdn.net/breadcheesebread/article/details/129238555)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^control_2,239^v3^insert_chatgpt"}} ] [.reference_item]
- *2* [51单片机引脚详解](https://blog.csdn.net/zhengqijun_/article/details/52627465)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^control_2,239^v3^insert_chatgpt"}} ] [.reference_item]
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