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1、电子钟（程序设计）CONTROL EQU 0C003H ；8253控制口COUNT0 EQU 0C000HCOUNT1 EQU 0C001HCOUNT2 EQU 0C002HMD8255 EQU 82H ；8255控制字PA8255 EQU 8000HCTL8255 EQU 8003HOUTBIT EQU 08002H ；位控制口OUTSEG EQU 08004H ；段控制口ICW1 EQU B
2、 ；8259，上升沿中断，要写ICW4ICW2 EQU B ；中断号为20HICW4 EQU B ；工作在8086/88方式OCW1 EQU B ；只响应INT0中断CS8259A EQU 0D000H ；8259地址CS8259B EQU 0D001HDATA SEGMENTCNT DB 0LEDBUF DB 6 DUP(?) ；显示缓冲NUM DB 1 DUP
3、(?) ；显示的数据DELAYT DB 1 DUP(?)HOUR DB 0MINUTE DB 0SECOND DB 0LEDMAP: ；八段管显示码 DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H DB 7FH,6FH,77H,7CH,39H,5EH,79H,71HDATA ENDSCODE SEGMENT ASSUME CS:CODE,DS:DATADELAY PROC NEAR
4、 ；延时子程序 PUSH AX PUSH CX MOV AL,0 MOV CX,AX LOOP $ POP CX POP AX RETDELAY ENDPDISPLAYLED PROC NEAR MOV BX,OFFSET LEDBUF MOV CL,6 ；共6个八段管 MOV AH,B ；从左边开始显示DLOOP:
5、 MOV DX, OUTBIT MOV AL, 0 OUT DX, AL ；关所有八段管 MOV AL, [BX] MOV DX, OUTSEG OUT DX, AL MOV DX, OUTBIT MOV AL, AH OUT DX, AL ；显示一位八段管 PUSH AX MOV AH,1 CALL DELAY
6、POP AX SHR AH,1 INC BX DEC CL JNZ DLOOP MOV DX,OUTBIT MOV AL,0 OUT DX,AL ；关所有八段管 RETDISPLAYLED ENDPIENTER PROC NEAR PUSH AX PUSH DX INC SECOND ；秒加1 MOV AL,SECO
7、ND CMP AL,60 ；秒数与60比较 JNE EXIT MOV SECOND,0 ；秒清零 INC MINUTE ；分加1 MOV AL,MINUTE CMP AL,60 ；分数与60比较 JNE EXIT MOV MINUTE,0 ；分清零
8、 INC HOUR ；时加1 MOV AL,HOUR CMP AL,24 ；时数与24比较 JNE EXIT MOV HOUR,0 ；时清零EXIT: MOV DX,CS8259A MOV
