ORG 0000H
AJMP MAIN
ORG 000BH
AJMP ZHD0
ORG 001BH
AJMP ZHD1
ORG 0040H
MAIN: 
    MOV TMOD,11H
    MOV TH0,#3CH
    MOV TL0,#0B0H
    MOV TH1,#5CH
    MOV TH1,#0B0H
    SETB ET0
    SETB  EA
    SETB TR0
    SJMP $
    SETB ET1
    SETB EA
    SETB TR1
    SJMP $
ZHD0: CLR P1.0
      MOV TH0,#3CH
      MOV TL0,#0B0H
      SETB TR0
      RETI
ZHD1: CLR P1.1
      MOV TH1,#5CH
     MOV TL1,#0B0H
      SETB TR1
      RETI
      END