5V Vss E Vo BOPF 07~008 Po D7- Do T3OPF XTAL2 ALE GND 2716 74LS373 Vcc +5 10F RST/VPD P2.2-P20 100g 8031 EN OE 8.2K9 P3 PI 图5-28031最小应用系统30PF XTAL1 ALE P2.2～P2.0 XTAL2 RST/VP D EA +5V 100Ω 8.2KΩ VC C 10μF PSEN VS S 8 8 8 8 8 8 OE D7～D0 G GND O7～O0 VC C 74LS373 +5V VC C A7～A0 VS S A1 0～A8 O7～O0 OE CE 2716 图5-2 8031最小应用系统