秒时钟的产生.asm

这个是大学的计算机接口实验课上经常用到的原程序

                 org     0000H
                 LJMP    MAIN
                 ORG     000BH
                 LJMP    T0SERVE
                 ORG     0050H
          MAIN:  MOV     SP,#60H
                 MOV     TMOD,#01H
                 MOV     TL0,#0B0H
                 MOV     TH0,#3CH
                 SETB    EA
                 SETB    ET0
                 MOV     R2,#0AH
                 SETB    TR0
           HERE: SJMP    HERE
        T0SERVE: MOV   TL0,#0B0H
                 MOV   TH0,#3CH
                 DJNZ  R2,LOOP
                 MOV   R2,#0AH
                 CPL   P1.0
           LOOP: RETi
                 end