基于51单片机的带时间显示和紧急控制的交通灯的设计1

                      MOVX                @DPTR,A
                      MOV                 A,#LEDFEQ                  ;置键盘扫描速率
                      MOVX                @DPTR,A
                      MOV                 A,#LEDCLS                  ;清除 LED 显示
                      MOVX                @DPTR,A
                      LCALL DELAY                      ;延时
                      POP                 ACC                        ;恢复现场
                      POP                 DPL
                      POP                 DPH
                      RET
                                         ;显示字符子程序
                                         ;输入: R4,位置 R5,值
DISLED:
                      PUSH                DPH                        ;保存现场
                      PUSH                DPL
                      PUSH                ACC
                      MOV                 A,#LEDWR0                  ;置显示起始地址
                      ADD                 A,R4                       ;加位置偏移量
                      MOV                 DPTR,#Z8279
                      MOVX                @DPTR,A                    ;设定显示位置
                      MOV                 DPTR,#LEDSEG ;置显示常数表起始位置
                      MOV                 A,R5
                      MOVC                A,@A+DPTR                  ;查表
                      MOV                 DPTR,#D8279
                      MOVX                @DPTR,A                    ;显示数据
                      POP                 ACC                        ;恢复现场
                      POP                 DPL
                      POP                 DPH
                      RET

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本文关键字：单片机  交通灯  自动控制-单片机，电子制作 - 自动控制-单片机