设计内容：51单片机系统原理图 器 二、设计内容：51单片机系统原理图 1 2 3 4 5 6 A B C D 1 2 3 4 5 6 D C B A Title Size Number Revision B Date: 19-Jun-2015 Sheet of File: H:\工艺实习\PCB\protel \87C52.DDB Drawn By: C3 22pF C2 22pF 1 2 XT AL RST R1 1K VCC VCC EA/VP 31 X1 19 X2 18 RE SET 9 RD 17 W R 16 INT0 12 INT1 13 T 0 14 T 1 15 P10/T 1 P11/T 2 P12 3 P13 4 P14 5 P15 6 P16 7 P17 8 P00 39 P01 38 P02 37 P03 36 P04 35 P05 34 P06 33 P07 32 P20 21 P21 22 P22 23 P23 24 P24 25 P25 26 P26 27 P27 28 PSEN 29 AL E/P 30 TXD 11 RXD 10 U1 80C52 X1 X2 X1 X2 1 6 2 7 3 8 4 9 5 J1 DB9 C6 0.1uF C5 0.1uF C4 0.1uF C7 0.1uF R1 IN 13 R2 IN 8 T1 IN 11 T2 IN 10 G ND 15 V + 2 V - 6 V CC 16 R1 OUT 12 R2 OUT 9 T1 OUT 14 T2 OUT 7 C1+ 1 C1 - 3 C2+ 4 C2 - 5 U2 MAX232CPE(16) VCC C1 22uf RS232_RX RS232_T X R2 1K D1 + RS232_RX RXD TXD RS232_T X 1 2 J2 CON2 VCC