基于51单片机的红外报警实验
当红外模块感应到输入信号，此时红外模块中的提示灯会亮，蜂鸣器响一声，当物体离开时，灯不亮蜂鸣器响一声；当红外感应模块感应不到输入信号，此时红外模块中的灯不亮，蜂鸣器不响；若出现紧急情况时，可以按下K3键，此时P1^3口对应的led灯亮，蜂鸣器响。...
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STM（System Timer）System Timer (STM)
System Timer (STM)The STM is designed for global system timing applications requiring both high precision and long period.Feature ListThe STM has the following features:• Free-running 64-bit counter• All 64 bits can be read synchronously• Differen
