ORG 0000H
    LJMP START
    ORG 000BH
    LJMP Timer0Interrupt

START:
    MOV SP,#60H
    MOV TMOD,#02H
    MOV TH0,#38H
    MOV TL0,#38H
    SETB EA
    SETB ET0
    SETB TR0
    SJMP $;

Timer0Interrupt:
    CPL P2.0;
    RETI

END