组成:电源 复位 时钟 调试接口 启动
1、电源 : 一般3.3V LDO供电 加多个0.01uf去耦电容
2、复位:有三种复位方式:上电复位、手动复位、程序自动复位
通常低电平复位:(51<a target="_blank" data-report-view="{"spm":"1001.2101.3001.7020","dest":"https://so.csdn.net/so/search?q=%E5%8D%95%E7%89%87%E6%9C%BA&spm=1001.2101.3001.7020"}" data-report-click="{"spm":"1001.2101.3001.7020","dest":"https://so.csdn.net/so/search?q=%E5%8D%95%E7%89%87%E6%9C%BA&spm=1001.2101.3001.7020"}" data-tit="单片机" data-pretit="单片机">单片机高电平复位,电容电阻位置调换)
上电复位,在上电瞬间,电容充电,RESET&spm=1001.2101.3001.7020" target="_blank" data-report-view="{"spm":"1001.2101.3001.7020","dest":"https://so.csdn.net/so/search?q=RESET&spm=1001.2101.3001.7020"}" data-report-click="{"spm":"1001.2101.3001.7020","dest":"https://so.csdn.net/so/search?q=RESET&spm=1001.2101.3001.7020"}" data-tit="RESET" data-pretit="reset">RESET出现短暂的低电平,该低电平持续时间由电阻和电容共同决定,计算方式如下:t = 1.1RC(固定计算公式) 1.110K0.1uF=1.1ms
需求的复位信号持续时间约在1ms左右。
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