微机原理课程设计——电子时钟课程设计.doc

电子时钟课程设计一：设计背景电子数字钟的应用十分广泛，通过计时精度很高的石英晶振（也可采用卫星传递的时钟标准信号），采用相应进制的计数器，转化为二进制数，经过译码和显示电路准确地将时间“时”“分”“秒”用数字的方式显示出来。与传统的机械钟相比，它具有走时准确，显示直观，无机械传动，无需人的经常调整等优点。它广泛用于电子表、车站、码头、广场等公共场所的大型远距离时间显示电子钟。二：数字钟电路设计思路利用8253定时器和中断控制器8259实现中断计时时，可用8253的两个通道（通道0和通道1）串联产生1S计时脉冲。每个1计时脉冲产生一次中断请求，在中断服务程序完成中断计时并刷新时间显示。利用8279键盘显示器实现当前时间的显示和时间的校准。在主程序完成各可编程接口芯片（8253、8259、8279）的初始化、键盘扫描及时间校准。在校表状态关中断，校表结束时开中断。时 分 秒秒计数器六十进制分计数器六十进制时计数器二十四进制较 时电 路秒脉冲发生器报 时电 路三： 三：程序流程图三、电子表原理图：四：程序代码D8279 equ 200HC8279 equ 202HC8253 equ 20bHD82530 equ 208HD82531 equ 209HC82590 equ 210HC82591 equ 211Hdata segmentHOUR db 00MINUTE db 00SECOND db 008STAT db 00LED db 31H,06H,5bH,4fH,66H,6dH,7dH,27H,7fH,6fH,00H,00HDISBUF db 8 dup(0)data endsstack segment stack dw 100 dup(?)stack endscode segment assume cs:code,ds:dataSTART: MOV AX,DATA MOV DS,AX CLI MOV AL,13H MOV DX,C82590 OUT DX,AL MOV AL,8 MOV DX,C82591 OUT DX,AL MOV AL,1 OUT DX,AL MOV AX,0 MOV ES,AX LEA AX,INT0 MOV AX,CS MOV ES:4*8+2,AX MOV DX,C8253 MOV AL,36H OUT DX,AL MOV DX,D82530 MOV AX,10000 OUT DX,AL MOV AL,AH OUT DX,AL MOV DX,C8253 MOV AL,36H OUT DX,AL MOV DX,D82531 MOV AX,100 OUT DX,AL MOV AL,AH OUT DX,AL MOV DX,C8279 MOV AL,00H OUT DX,AL MOV AL,34H OUT DX,AL MOV AL,0D2H OUT DX,AL MOV STAT,0 MOV DX,C82591 MOV AL,0FEH OUT DX,ALWAIT1: MOV DX,C8279 IN AL,DX MOV AH,AL AND AL,80H JNE WAIT1 MOV AL,AH AND AL,0FH CMP AL,00H JE WAIT1 MOV AL,40H OUT DX,ALCHK: MOV DX,D8279 IN AL,DX CMP AL,33H JNE BBB MOV DX,C82591 MOV AL,0FFH OUT DX,AL MOV AL,STAT INC AL MOV STAT,AL CMP AL,1 JNZ AA1 MOV SI,OFFSET DISPBUF MOV CX,4 MOV AL,00BB0: MOV SI,AL INC SI LOOP BB0 CALL DISP JMP CHKAA1: CMP AL,2 JNZ AA2 MOV SI,OFFSET DISPBUF MOV AL,00 MOV SI,AL INC SI MOV SI,AL ADD SI,2 MOV SI,AL INC SI MOV SI,AL CALL DISP JMP CHKAA2: CMP AL,3 JNZ AA3 MOV SI,OFFSET DISPBUF+2 MOV CX,4 MOV AL,00BB1: MOV SI,AL INC SI LOOP BB1 CALL DISP JMP CHKAA3: MOV STAT,00 MOV AL,0FEH MOV DX,C82591 OUT DX,AL CALL FULLSFM CALL DISP JMP CHKBBB: CMP AL,3BH JE BBB0 JMP CCCBB0: MOV AL,STAT CMP AL,1 JNZ BBB1 MOV AL,HOUR ADD AL,1 DAA MOV HOUR,AL CALL FULLSH1 CALL DISP JMP BBBBBB1: MOV AL,STAT CMP AL,2 JNZ BBB3 MOV AL,MINUTE ADD AL,1 DAA MOV MINUTE,AL CALL FULLFEN CALL DISP JMP BBBBBB3: MOV AL,STAT CMP AL,3 JZ BBB4 JMP DDDBBB4: MOV AL,SECOND ADD AL,1 DAA MOV SECOND,AL CALL FULLMIAO CALL DISP JMP BBBCCC: CMP AL,3AH JE CC0 JMP DDDCC0: MOV AL,STAT CMP AL,1 JNZ CCC1 MOV AL,HOUR SUB AL,1 DAS MOV AL,HOUR SUB AL,1 ADD AL,1 DAA MOV SECOND,AL CMP AL,60H JNZ FANHUI MOV SECOND,0 MOV AL,MINUTE ADD AL,1 DAA MOV MINUTE,AL CMP AL,60H JNZ FANHUI MOV MINUTE,0 MOV AL,HOUR ADD AL,1 DAA MOV HOUR,AL CMP AL,24H JNZ FANHUI MOV HOUR,0 CALL FULLSFM CALL DISP POP SI POP DI POP BX POP AX IRETFULL SFM PROC NEAR LEA DI,DISBUF LEA BX,LED LEA SI,SECOND MOV CX,3AA4: MOV AL,SI AND AL,0FH XLAT MOV DI,AL INC DI MOV AL,SI PUSH CX MOV CL,4 SHR AL,CL AND AL,0FH XLAT MOV DI,AL INC DI POP CX INC SI LOOP AA4 RETFULL SFM ENDPFULL SHI PROC NEAR LEA SI,DISBUF MOV AL,0 MOV CX,4CCC0: MOV SI,AL INC SI LOOP CCC0 LEA BX,LED MOV AL,HOUR AND AL,0FH XLAT MOV SI,AL XLAT MOV SI,AL MOV AL,HOUR MOV CL,4 SHR AL,CL AND AL,0FH XLAT INC SI MOV SI,AL RETFULL SHI ENDPFULL FEN PROC NEAR LEA SI,DISBUF MOV AL,0 MOV SI,AL INC SI MOV SI,AL INC SI LEA BX,LED MOV AL,MINUTE AND AL,0FH XLAT MOV SI,AL MOV AL,MINUTE MOV CL,4 SHR AL,CL AND AL,0FH XLAT INC SI MOV SI,AL RETFULL FEN ENDPFULL MIAO PROC NEAR LEA SI,DISBUF LEA BX,LED MOV AL,SECOND AND AL,0FH XLAT MOV SI,AL MOV AL,SECOND MOV CL,4 SHR AL,CL AND AL,0FH XLAT INC SI MOV SI,AL MOV AL,0 INC SI MOV SI,AL