NOIP蒟蒻的//专栏

一只NOIp的蒟蒻，可能会写以下内容： # 计算机和程序设计 # 题解 # 物理（虽然并没过B卷） # 各种神奇的练习题

投稿

订阅

订阅数

获赞数

10

阅读数

38.6万

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提问：STC15W单片机的外部复位电路

Aromatisation2025/03/10 13:10:30NOIP蒟蒻的//专栏

关键词

单片机8051复位

最近遇到了一个奇怪的现象：标准的 STC15W 单片机复位电路不能正确复位单片机。电路如下：

经过测量，平时 P5.4 上有 2.5V 左右的电压。按下复位按钮后，P5.4 = 5V (Vcc)，松开后，单片机不复位，也不执行程序。此时用万用表电流档位连接到 10k 电阻上（类似短路），单片机可以开始执行程序。

猜测的原因是，P5.4 内部电路是下面这样（仅仅是猜测，因为 datasheet 未写明）：

因此，不按下开关的时候，P5.4 上有 ~2.5V (1/2Vcc) 的电压，按下后 P5.4 直连 Vcc，但是松开后因为有 Schmitt 触发器，P5.4 电压不够低（低至 Schmitt 触发器的复位电压），故无法使得 MCU 重新开始运行。

上述只是猜测，没有 datasheet 等资料的证实。按目前的情况，调小 10k 电阻应该可以使得其正确复位。请问是否有人知道相关细节，或者知道这个复位电路可以怎么设计（注意 Vcc = 5V）？

STC 的单片机好些信息在数据手册中没写明白，确实会造成一定的困扰。

[修改于 18 天前 - 2025/03/10 13:10:30]

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大仙

万流景仰

17天14时前 IP:江苏

942567

1楼

建议你去厂家论坛问，他们解答速度比较快。

千古风流

17天12时前 IP:上海

942569

2楼

啊我一直以为 STC是低电平复位

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