￡《5V GND GND 24I128 EA P2.3 24 21 VCC GNDCE A10 P2 P07 P0.6 P0.5 743 D4504124A4 3Q3 8031 PO 38 Q/52 P00|38 00 81A0 4KiA8 GND 07 06 15 13 10 ALE30 9100 PSEN OE/VPP 图122单片机扩展2732 EPROM电路P2.0 P2.1 P2.2 P2.3 P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.7 P0.6 18 17 14 13 8 7 4 3 19 16 15 12 1 9 6 5 2 2 3 4 5 6 7 8 21 19 22 23 17 16 15 14 13 11 10 9 29 20 30 24 23 22 21 32 33 34 35 36 37 38 39 11 1 D7 D6 D5 D4 D3 D2 D1 D0 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 O7 O6 O5 O4 O3 O2 O1 O0 OE/VPP ALE PSEN G OE GND GND 24 12 18 VCC GNDCE EA 31 GND 8031 2732 4K¡Á8 74L S37 3 £«5 V 图12.2 单片机扩展2732 EPROM电路