单时钟完成多点分别计时的实现和应用

      A,#20,DE5I
                        CLR      

2CH.3
                        LCALL     OUT01
                        MOV       53H,#00H
DE5I:                   LJMP      DE5
DEAL5:                 JNB       2CH.4,DE6I
                 INC       54H
                        MOV       A,54H
                        CJNE      A,#20,DE6I
                        CLR       2CH.4
                        MOV       54H,#00H
                        LCALL     OUT01
DE6I:                   LJMP      DE6
DEAL6:                  JNB       2CH.5,DE7I
                  INC       55H

《单时钟完成多点分别计时的实现和应用(第7页)》