（分享設(shè)計(jì)）單片機(jī)秒表

ID:415602 · 發(fā)表于 2018-11-2 09:04

                                                         ORG 0000H
                                                         START:
                                                         MOV P0,#00H
                                                         JB P1.0,$
                                                         CALL FILTER
                                                         JNB P1.0,$
                                                         MOV R0,#00
                                                         PRESS1:MOV A,R0
                                                         MOV P0,A
                                                         MOV R2,#10
                                                         ADD1:
                                                         MOV R3,#200
                                                         CALL DELAY05
                                                         DJNZ R2,ADD1
                                                         MOV A,R0
                                                         ADD A,#01H
                                                         DA A
                                                         MOV R0,A
                                                         SJMP PRESS1
                                                         PRESS2:
                                                         CALL FILTER
                                                         JB p1.0,PRESS2
                                                         PRESS3:
                                                         JB P1.0,$
                                                         CALL FILTER
                                                         RELEASE:
                                                         JB P1.0,START
                                                            SJMP RELEASE
                                                         DELAY05:
                                                         MOV R4,#250
                                                         JNB P2.0,PRESS2
                                                         DJNZ R4,$
                                                         DJNZ R3,DELAY05
                                                         RET
                                                         FILTER:
                                                         MOV R5,#40
                                                         DEL:
                                                         MOV R6,#250
                                                         DJNZ R6,$
                                                         DJNZ R5,DEL
                                                         RET
                                                         END

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（分享設(shè)計(jì)）單片機(jī)秒表

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