1747-DPS1
1747-DPS1
1747-DPS1
在上电或复位过程中，控制CPU的复位状态：这段时间内让CPU保持复位状态，而不是一上电或刚复位完毕就工作，防止CPU发出错误的指令、执行错误操作，也可以提高电磁兼容性能。
无论用户使用类型的单片机,要涉及到单片机复位电路的设计。而单片机复位电路设计的好坏,直接影响到整个系统工作的可靠性。许多用户在设计完单片机系统,并在实验室调试后,在现场却出现了“死机”、“程序走飞”等现象,这主要是单片机的复位电路设计不可靠引起的。
基本的复位方式
单片机在启动时都需要复位，以使CPU及系统各部件处于确定的初始状态，并从初态开始工作。89系列单片机的复位信号是从RST引脚输入到芯片内的施密特触发器中的。当系统处于正常工作状态时，且振荡器稳定后，如果RST引脚上有一个高电平并维持2个机器周期(24个振荡周期)以上，则CPU就可以响应并将系统复位。单片机系统的复位方式有：手动按钮复位和上电复位。
备货，备货，降降降，火火火，火火火……
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