2.1 Design ideas
First, use the three chips 8255, 8254, and 8259 to realize the function of the electronic clock so that the alarm clock can run normally; secondly, add the alarm function, the hourly time function, and set the current time function on the basis of the clock; complete the design.
2.2 Design plan
1. Electronic clock part: This design is to count the pulse by setting the count value of the counter 8254. In the program, 8254 works on counter 0 and method 3. The CLK connected is 1MHz, the initial value of the design is 10,000, and counts every 100 interrupts. The generated counting time is exactly the time passed by the clock every second. The interrupt is controlled by setting the initial value of the initialization command word for the interrupt controller 8259. The single bits of time, second, minute and ten bits are stored separately in the program through shift instructions, and the single bits of minutes and second are stored in the specified registers respectively. Compare transfer instructions to complete the accumulation of seconds and minutes. The seven-segment digital tube is selected by port A of the 8255 parallel interface, and the segment code to be displayed is output through port B. In this way, hours, minutes and seconds are displayed on the 6 seven-segment digital tubes respectively. When the 1S time arrives, modify the current digital tube value, clear the low position of the second at 10 seconds, add 1 to the high position, and the same is true for the minutes and sum; when it reaches 60 seconds, clear the second, add 1 to the minute, and when it reaches 60 minutes, clear the minute, add 1 to the hour, and when it arrives 24 hours, all clear the zero.
2. Alarm ringing part: For the alarm part, we must first complete the connection and design of the keys of the digital tube display unit, so that the 16 keys are 0-F respectively; then use the single pulse input of KK1 of the experimental platform to generate an interrupt, so that the time can be set. Store the set time and compare it with the current time. When the time is the same, counter 1 works, the buzzer beeps, and music is played, which completes the alarm ringing function.
3. Octopus time report: Octopus time report means that the ring ring is ringing at the full time. At the hour of the clock, no matter what time it is, the minute and second parts of the clock are zero. Therefore, as long as the minute and second parts of the clock are compared with zero, when they are all equal, it means that the hour point has arrived and the bell can be ringed. The hourly time report is completed, and the hourly time report time set by this alarm clock is 5 seconds.
4. Set the current time: This part also uses the key part of the digital tube display unit. Just use the previous design. This time, KK2 inputted with a single pulse will generate an interrupt setting time, and then store the set time in the time variable, and the time will be set.
A8254 EQU 06C0H ;Macro definition B8254 EQU 06C2H C8254 EQU 06C4H CON8254 EQU 06C6H MY8255_A EQU 0600H MY8255_B EQU 0602H MY8255_C EQU 0604H MY8255_CON EQU 0606H PUBLIC SEC,MIN,HOUR DATA SEGMENT ;Define data segments TAB DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H ;Digital meter DB 7FH,6FH,77H,7CH,39H,5EH,79H,71H FREQ_LIST DW 371,495,495,495,624,556,495,556,624 ;Frequency table DW 495,495,624,742,833,833,833,742,624 DW 624,495,556,495,556,624,495,416,416,371 DW 495,833,742,624,624,495,556,495,556,833 DW 742,624,624,742,833,990,742,624,624,495 DW 556,495,556,624,495,416,416,371,495,0 TIME_LIST DB 4, 6, 2, 4, 4, 6, 2, 4, 4 ;schedule DB 6, 2, 4, 4, 12, 1, 3, 6, 2 DB 4, 4, 6, 2, 4, 4, 6, 2, 4, 4 DB 12, 4, 6, 2, 4, 4, 6, 2, 4, 4 DB 6, 2, 4, 4, 12, 4, 6, 2, 4, 4 DB 6, 2, 4, 4, 6, 2, 4, 4, 12 SEC DB 0 ;initialization HOUR DB 0 MIN DB 0 N_TIME DB 20 DUP(0) Z_TIME DB 20 DUP(0) N_S DB 30 N_M DB 0 N_H DB 0 TIMER DB 10 DUP(0) DUAN DB 0 BUF DB 3 DUP(0) DATA ENDS SSTACK SEGMENT STACK ;Stack segment DW 256 DUP(?) SSTACK ENDS CODE SEGMENT ;Code segment ASSUME CS:CODE, SS:SSTACK,DS:DATA START: ;8254initialization MOV DX, CON8254 ;8254 MOV AL, 36H ;counter0，Way3 OUT DX, AL ;Dividing frequency MOV DX, A8254 MOV AL, 010H OUT DX, AL MOV AL, 27H OUT DX, AL ;8255initialization MOV AL,81H MOV DX,MY8255_CON OUT DX,AL ;MIR7Interrupt MOV AX, 0000H MOV DS, AX MOV AX, OFFSET MIR7 ;PickInterrupt入口地址 MOV SI, 003CH ;Interrupt矢量地址 MOV [SI], AX ;fillIRQ7offset vector MOV AX, SEG MIR7 ;Section address MOV SI, 003EH MOV [SI], AX ;fillIRQ7的Section address矢量 ;MIR6Interrupt MOV AX, OFFSET MIR6 ;PickInterrupt入口地址 MOV SI, 0038H ;Interrupt矢量地址 MOV [SI], AX ;fillIRQ6offset vector MOV AX, SEG MIR6 ;Section address MOV SI, 003AH MOV [SI], AX ;fillIRQ6的Section address矢量 ;MIR2Interrupt MOV AX, OFFSET SIR1 ;PickInterrupt入口地址 MOV SI, 00C4H ;Interrupt矢量地址 MOV [SI], AX ;fillSIR1offset vector MOV AX, SEG SIR1 ;Section address MOV SI, 00C6H MOV [SI], AX ;fillSIR1的Section address矢量 ;8259initialization MOV AL, 11H OUT 20H, AL ;ICW1 MOV AL, 08H OUT 21H, AL MOV AL,04H OUT 21H,AL ;ICW2 MOV AL, 03H OUT 21H, AL ;ICW4 ;initialization从片8259 MOV AL, 11H OUT 0A0H, AL ;ICW1 MOV AL, 30H OUT 0A1H, AL ;ICW2 MOV AL, 02H OUT 0A1H, AL ;ICW3 MOV AL, 01H OUT 0A1H, AL ;ICW4 MOV AL, 0FDH OUT 0A1H,AL ;OCW1 = 1111 1101 MOV AX,SEG N_TIME ;PickN_TIME的Section address MOV DS,AX MOV SI,OFFSET N_TIME ;PickN_TIMEAddress offset MOV [SI+1],1 STI AA1: CALL DISP ;Call the display subroutine(disp) CALL BJ ;Call the alarm clock(bj) CALL ZDBS ;Call the full time(bj) JMP AA1 MIR6 PROC CLI PUSH AX PUSH SI MOV AX,DATA MOV DS,AX MOV SI,3000H MOV AL,00H MOV [SI],AL ;Clear display buffer MOV [SI+1],AL MOV [SI+2],AL MOV [SI+3],AL MOV [SI+4],AL MOV [SI+5],AL MOV DI,3005H MOV DX,MY8255_CON ;Write8255Control word MOV AL,81H OUT DX,AL BEGIN: CALL DIS ;Call the display subroutine CALL CLEAR ;Clear the screen CALL CCSCAN ;scanning JNZ INK1 JMP BEGIN INK1: CALL DIS CALL KEYDALLY CALL KEYDALLY CALL CLEAR CALL CCSCAN MOV AX,SEG DUAN ;PickDUAN的Section address MOV DS,AX MOV SI,OFFSET DUAN ;PickDUANAddress offset，For technical counting MOV AL,[SI] INC AL MOV [SI],AL CMP AL,7 ;ALand6Comparison JE B2 JNZ INK2 ;Press with key，Go toINK2 JMP BEGIN ;======================================== ;Determine the position of pressing the key ;======================================== B2: MOV AL,0 MOV [SI],AL POP AX POP SI IRET INK2: MOV CH,0FEH MOV CL,00H COLUM: MOV AL,CH MOV DX,MY8255_A OUT DX,AL MOV DX,MY8255_C IN AL,DX L1: TEST AL,01H ;is L1? JNZ L2 MOV AL,00H ;L1 JMP KCODE L2: TEST AL,02H ;is L2? JNZ L3 MOV AL,04H ;L2 JMP KCODE L3: TEST AL,04H ;is L3? JNZ L4 MOV AL,08H ;L3 JMP KCODE L4: TEST AL,08H ;is L4? JNZ NEXT MOV AL,0CH ;L4 KCODE: ADD AL,CL CALL PUTBUF PUSH AX KON: CALL DIS CALL CLEAR CALL CCSCAN JNZ KON POP AX NEXT: INC CL MOV AL,CH TEST AL,08H JZ KERR ROL AL,1 MOV CH,AL JMP COLUM KERR: JMP BEGIN ;======================================== ;键盘scanning子程序 ;======================================== CCSCAN: MOV AL,00H MOV DX,MY8255_A OUT DX,AL MOV DX,MY8255_C IN AL,DX NOT AL AND AL,0FH RET ;======================================== ;Clear the screen子程序 ;======================================== CLEAR: MOV DX,MY8255_B MOV AL,00H OUT DX,AL RET ;======================================== ;Show subroutines ;======================================== DIS: PUSH AX MOV SI,3000H MOV DL,0DFH MOV AL,DL AGAIN: PUSH DX MOV DX,MY8255_A OUT DX,AL MOV AL,[SI] MOV BX,OFFSET TAB AND AX,00FFH ADD BX,AX MOV AL,[BX] MOV DX,MY8255_B OUT DX,AL CALL KEYDALLY INC SI POP DX MOV AL,DL TEST AL,01H JZ OUT1 ROR AL,1 MOV DL,AL JMP AGAIN OUT1: POP AX RET ;====== Delay subroutine ====== KEYDALLY: PUSH CX MOV CX,0006H D1: MOV AX,009FH D2: DEC AX JNZ D2 LOOP D1 POP CX RET ;======================================== ;Save the keyboard value into the buffer of the corresponding bit ;======================================== PUTBUF: MOV SI,DI MOV [SI],AL MOV CX,SEG DUAN ;PickDUAN的Section address MOV DS,CX MOV SI,OFFSET DUAN ;PickDUANAddress offset MOV BX,[SI] MOV CX,SEG N_TIME ;PickDUAN的Section address MOV DS,CX MOV SI,OFFSET N_TIME ;PickDUANAddress offset MOV [SI+BX],AL MOV DX,[SI+BX] DEC DI CMP DI,2FFFH JNZ GOBACK MOV DI,3005H GOBACK: RET MIR6 ENDP SIR1 PROC CLI PUSH AX PUSH SI MOV AX,DATA MOV DS,AX MOV SI,3000H MOV AL,00H MOV [SI],AL ;Clear display buffer MOV [SI+1],AL MOV [SI+2],AL MOV [SI+3],AL MOV [SI+4],AL MOV [SI+5],AL MOV DI,3005H MOV DX,MY8255_CON ;Write8255Control word MOV AL,81H OUT DX,AL BEGIN_U: CALL DIS1 ;Call the display subroutine CALL CLEAR1 ;Clear the screen CALL CCSCAN1 ;scanning JNZ INK3 JMP BEGIN_U INK3: CALL DIS1 CALL U_DALLY CALL U_DALLY CALL CLEAR1 CALL CCSCAN1 MOV AX,SEG DUAN ;PickDUAN的Section address MOV DS,AX MOV SI,OFFSET DUAN ;PickDUANAddress offset MOV AL,[SI] INC AL MOV [SI],AL CMP AL,7 ;ALand7Comparison JE B3 JNZ INK4 ;Press with key，Go toINK2 JMP BEGIN_U ;======================================== ;Determine the position of pressing the key ;======================================== B3: MOV AL,0 MOV [SI],AL POP AX POP SI IRET INK4: MOV CH,0FEH MOV CL,00H COLUM2: MOV AL,CH MOV DX,MY8255_A OUT DX,AL MOV DX,MY8255_C IN AL,DX U1: TEST AL,01H ;is L1? JNZ U2 MOV AL,00H ;L1 JMP KCODE1 U2: TEST AL,02H ;is L2? JNZ U3 MOV AL,04H ;L2 JMP KCODE1 U3: TEST AL,04H ;is L3? JNZ U4 MOV AL,08H ;L3 JMP KCODE1 U4: TEST AL,08H ;is L4? JNZ NEXT1 MOV AL,0CH ;L4 KCODE1: ADD AL,CL CALL PUTBUF1 PUSH AX KON1: CALL DIS1 CALL CLEAR1 CALL CCSCAN1 JNZ KON1 POP AX NEXT1: INC CL MOV AL,CH TEST AL,08H JZ KERR1 ROL AL,1 MOV CH,AL JMP COLUM2 KERR1: JMP BEGIN_U ;======================================== ;键盘scanning子程序 ;======================================== CCSCAN1: MOV AL,00H MOV DX,MY8255_A OUT DX,AL MOV DX,MY8255_C IN AL,DX NOT AL AND AL,0FH RET ;======================================== ;Clear the screen子程序 ;======================================== CLEAR1: MOV DX,MY8255_B MOV AL,00H OUT DX,AL RET ;======================================== ;Show subroutines ;======================================== DIS1: PUSH AX MOV SI,3000H MOV DL,0DFH MOV AL,DL AGAIN1: PUSH DX MOV DX,MY8255_A OUT DX,AL MOV AL,[SI] MOV BX,OFFSET TAB AND AX,00FFH ADD BX,AX MOV AL,[BX] MOV DX,MY8255_B OUT DX,AL CALL U_DALLY INC SI POP DX MOV AL,DL TEST AL,01H JZ OUT2 ROR AL,1 MOV DL,AL JMP AGAIN1 OUT2: POP AX RET ;====== Delay subroutine ====== U_DALLY: PUSH CX MOV CX,0006H W1: MOV AX,009FH W2: DEC AX JNZ W2 LOOP W1 POP CX RET ;======================================== ;Save the keyboard value into the buffer of the corresponding bit ;======================================== PUTBUF1: MOV SI,DI MOV [SI],AL MOV CX,SEG DUAN ;PickDUAN的Section address MOV DS,CX MOV SI,OFFSET DUAN ;PickDUANAddress offset MOV BX,[SI] MOV CX,SEG TIMER ;PickDUAN的Section address MOV DS,CX MOV SI,OFFSET TIMER ;PickDUANAddress offset MOV [SI+BX],AL MOV DX,[SI+BX] DEC DI CMP DI,2FFFH JNZ GOBACK1 MOV DI,3005H GOBACK1: RET SIR1 ENDP MIR7 PROC STI ;置Interrupt标志位IF PUSH AX ;Press the stack PUSH SI MOV AX,SEG TIMER ;PickTIMER的Section address MOV DS,AX MOV SI,OFFSET TIMER ;PickTIMERAddress offset MOV AL,[SI] INC AL MOV [SI],AL CMP AL,100 ;ALand100Comparison JNE TRNED ;If equal，Jump MOV AL,0 ;If not, execute downward MOV [SI],AL MOV AL,[SI+1] ADD AL,1 DAA ;Decimal adjustment，Used for addition MOV [SI+1],AL CMP AL,60H JNE TRNED MOV AL,0 MOV [SI+1],AL MOV AL,[SI+2] ADD AL,1 DAA MOV [SI+2],AL CMP AL,60H JNE TRNED MOV AL,0 MOV [SI+2],AL MOV AL,[SI+3] ADD AL,1 DAA MOV [SI+3],AL CMP AL,24H JNE TRNED MOV AL,0 MOV [SI+3],AL TRNED: MOV AL,[SI+1] MOV SEC,AL MOV AL,[SI+2] MOV MIN,AL MOV AL,[SI+3] MOV HOUR,AL POP SI ;Out the stack POP AX STI ;置Interrupt标志位IF IRET ;Interrupt返回 ENDP DISP: PUSH BX PUSH DI PUSH AX PUSH SI MOV DX,MY8255_B MOV AX,SEG TAB MOV DS,AX MOV BX,OFFSET TAB MOV AL,SEC AND AL,0FH ;and低四位相and MOV AH,00H MOV SI,AX MOV AL,[BX+SI] OUT DX,AL MOV DX,MY8255_A MOV AL,0DFH OUT DX,AL CALL DALLY MOV AL,SEC AND AL,0F0H ror al,04 MOV AH,00H MOV SI,AX MOV AL,[BX+SI] MOV DX,MY8255_B OUT DX,AL MOV DX,MY8255_A MOV AL,0EFH OUT DX,AL CALL DALLY MOV AL,MIN AND AL,0FH MOV AH,00H MOV SI,AX MOV AL,[BX+SI] MOV DX,MY8255_B OUT DX,AL MOV DX,MY8255_A MOV AL,0F7H OUT DX,AL CALL DALLY MOV AL,MIN AND AL,0F0H ror al,04 MOV AH,00H MOV SI,AX MOV AL,[BX+SI] MOV DX,MY8255_B OUT DX,AL MOV DX,MY8255_A MOV AL,0FBH OUT DX,AL CALL DALLY MOV AL,HOUR AND AL,0FH MOV AH,00H MOV SI,AX MOV AL,[BX+SI] MOV DX,MY8255_B OUT DX,AL MOV DX,MY8255_A MOV AL,0FDH OUT DX,AL CALL DALLY MOV AL,HOUR AND AL,0F0H ror al,04 MOV AH,00H MOV SI,AX MOV AL,[BX+SI] MOV DX,MY8255_B OUT DX,AL MOV DX,MY8255_A MOV AL,0FEH OUT DX,AL CALL DALLY POP SI POP AX POP DI POP BX RET ZDBS PROC ;Time report at the hour MOV AL,MIN CMP AL,00H JNZ LP2 MOV AL,SEC CMP AL,00H JNZ LP2 MOV DX, CON8254 ;8254 MOV AL, 76H ;counter1，Way3 OUT DX, AL ZD1: MOV DX, B8254 MOV AL, 00H OUT DX, AL MOV AL, 09H OUT DX, AL MOV AL,SEC CMP AL,05H JE OUTZD CALL DISP JMP ZD1 OUTZD: MOV AX,00H OUT DX,AL MOV AL,AH OUT DX,AL RET LP2: RET ZDBS ENDP BJ PROC ;Alarm program MOV AL,HOUR MOV CX,SEG N_TIME ;PickDUAN的Section address MOV DS,CX MOV SI,OFFSET N_TIME ;PickDUANAddress offset MOV BL,[SI+1] ROL BL,04 MOV AL,0 MOV AL,[SI+2] OR BL,AL CMP AL,BL JNZ LP MOV CX,SEG N_TIME ;PickDUAN的Section address MOV DS,CX MOV SI,OFFSET N_TIME ;PickDUANAddress offset MOV BL,[SI+3] ROL BL,04 MOV AL,0 MOV AL,[SI+4] OR BL,AL MOV AL,MIN CMP AL,BL JNZ LP MOV CX,SEG N_TIME ;PickDUAN的Section address MOV DS,CX MOV SI,OFFSET N_TIME ;PickDUANAddress offset MOV BL,[SI+5] ROL BL,04 MOV AL,0 MOV AL,[SI+6] OR BL,AL MOV AL,SEC CMP AL,BL JNZ LP MOV DX, CON8254 ;8254 MOV AL, 76H ;counter1，Way3 OUT DX, AL BEGIN_M: MOV BX,OFFSET FREQ_LIST MOV DI,OFFSET TIME_LIST ;装入schedule起始地址 PLAY: MOV DX,0FH ;The input clock is1MHz，1M = 0F4240H MOV AX,4240H DIV WORD PTR [BX] ;Pick出频率值计算计数初值，0F4240H / Output frequency MOV DX,B8254 OUT DX,AL ;Load count initial value MOV AL,AH OUT DX,AL MOV DL,[DI] ;Pick出演奏相对时间，调用Delay subroutine CALL DALLY2 ADD BX,2 INC DI CMP WORD PTR [BX],0 ;Determine whether it is at the end of the song？ JE OUTPLAY CALL DISP JMP PLAY OUTPLAY:MOV DX,B8254 MOV AX,00H OUT DX,AL MOV AL,AH OUT DX,AL RET LP: RET DALLY2 PROC ;Delay subroutine H0: MOV CX,0010H H1: MOV AX,0FF0H H2: DEC AX JNZ H2 LOOP H1 DEC DL JNZ H0 RET DALLY2 ENDP BJ ENDP DALLY: PUSH CX MOV CX,0006H T1: MOV AX,009FH T2: DEC AX JNZ T2 LOOP T1 POP CX RET CODE ENDS
Summarize
The above is a detailed explanation of the assembly language implementation of electronic alarm clocks introduced to you by the editor. I hope it will be helpful to you!