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External-hardware-interrupt
- 当外部中断没有发生时,接在PD口的8个发光二极管一起不停的闪烁,当外部中断发生时,即开关S0被按一次后,接在PD0口的D0二极管不停的闪烁。-When the external interrupt did not occur, then 8 in the PD population with non-stop blinking light-emitting diode, when the external interrupt occurs, the switch S0 is pressed on