2复位电路 R24 100K u 8 2 4 BTN RST - BTN RST BUTTON C14 SN74AHCIG14 1 OuF 2 YY=A 单施密特反相器芯片SN74AHC1G14 X2 3时钟电路 C2912 pF YI 12MHZ C27‖|12pF XI2.复位电路 + C14 10uF R24 100K 3.3V 1 2 S1 BUTTON BTN_RST BTN_RST 3.3V 2 4 5 3 U 8 SN74AHC1G14 X2 X1 2 1 Y 1 12MHz C27 12 pF C29 12 pF 3.时钟电路 Y = A 单施密特反相器芯片SN74AHC1G14 7