1 1 2 2 3 3 4 4 D D C C B B A A Title Number Revision Size A4 Date: 2011-8-2 Sheet of File: C:\Documents and Settings\..\ .SchDoc Drawn By: EA/VP 31 X1 19 X2 18 RESET 9 RD 17 WR 16 INT0 12 INT1 13 T0 14 T1 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 ALE/P 30 TXD 11 RXD 10 U1 STC89C51 D? D? D? D? 1 2 3 4 5 6 7 8 9 P? Header 9 GND 1 VCC 2 VO 3 RS 4 RW 5 E 6 DB0 7 DB1 8
