用汇编语言写一个数码时钟程序

;功能说明

;用STC的MCU的IO方式控制74HC595驱动8位数码管。

;显示效果为: 数码时钟.

;使用Timer0的16位自动重装来产生1ms节拍,程序运行于这个节拍下, 用户修改MCU主时钟频率时,自动定时于1ms.

Fosc_KHZ EQU 22118 ;22118KHZ

STACK_POIRTER EQU 0D0H ;堆栈开始地址

Timer0_Reload EQU (65536 - Fosc_KHZ) ; Timer 0 中断频率, 1000次/秒

DIS_DOT EQU 020H

DIS_BLACK EQU 010H

DIS_ EQU 011H

P0M1 DATA 0x93 ;

P0M0 DATA 0x94 ;

P1M1 DATA 0x91 ;

P1M0 DATA 0x92 ;

P2M1 DATA 0x95 ;

P2M0 DATA 0x96 ;

P3M1 DATA 0xB1 ;

P3M0 DATA 0xB2 ;

P4M1 DATA 0xB3 ;

P4M0 DATA 0xB4 ;

P5M1 DATA 0xC9 ;

P5M0 DATA 0xCA ;

P6M1 DATA 0xCB ;

P6M0 DATA 0xCC ;

P7M1 DATA 0xE1 ;

P7M0 DATA 0xE2 ;

AUXR DATA 08EH

P4 DATA 0C0H

P5 DATA 0C8H

;IO口定义

P_HC595_SER BIT P4.0 ; //pin 14 SER data input

P_HC595_RCLK BIT P5.4 ; //pin 12 RCLk store (latch) clock

P_HC595_SRCLK BIT P4.3 ; //pin 11 SRCLK Shift data clock

;本地变量声明

Flag0 DATA 20H

B_1ms BIT Flag0.0 ; 1ms标志

LED8 DATA 30H ; 显示缓冲 30H ~ 37H

display_index DATA 38H ; 显示位索引

hour DATA 39H ;

minute DATA 3AH

second DATA 3BH ;

msecond_H DATA 3CH ;

msecond_L DATA 3DH ;

ORG 0000H ;reset

LJMP F_Main

ORG 000BH ;1 Timer0 interrupt

LJMP F_Timer0_Interrupt

;主程序

ORG 0100H ;reset

F_Main:

CLR A

MOV P0M1, A ;设置为准双向口

MOV P0M0, A

MOV P1M1, A ;设置为准双向口

MOV P1M0, A

MOV P2M1, A ;设置为准双向口

MOV P2M0, A

MOV P3M1, A ;设置为准双向口

MOV P3M0, A

MOV P4M1, A ;设置为准双向口

MOV P4M0, A

MOV P5M1, A ;设置为准双向口

MOV P5M0, A

MOV P6M1, A ;设置为准双向口

MOV P6M0, A

MOV P7M1, A ;设置为准双向口

MOV P7M0, A

MOV SP, #STACK_POIRTER

MOV PSW, #0

USING 0 ;选择第0组R0~R7

;用户初始化程序

MOV display_index, #0

MOV R0, #LED8

MOV R2, #8

L_ClearLoop:

MOV @R0, #DIS_BLACK ;上电消隐

INC R0

DJNZ R2, L_ClearLoop

CLR TR0

ORL AUXR, #(1 SHL 7) ; Timer0_1T();

ANL TMOD, #NOT 04H ; Timer0_AsTimer();

ANL TMOD, #NOT 03H ; Timer0_16bitAutoReload();

MOV TH0, #Timer0_Reload / 256 ;Timer0_Load(Timer0_Reload);

MOV TL0, #Timer0_Reload MOD 256

SETB ET0 ; Timer0_InterruptEnable();

SETB TR0 ; Timer0_Run();

SETB EA ; 打开总中断

MOV hour, #12 ; 初始化时间值

MOV minute, #0

MOV second, #0

LCALL F_DisplayRTC

;主循环

L_Main_Loop:

JNB B_1ms, L_Main_Loop ;1ms未到

CLR B_1ms

INC msecond_L ;msecond + 1

MOV A, msecond_L

JNZ L_Check1000ms

INC msecond_H

L_Check1000ms:

MOV A, msecond_L ;msecond - 1000

CLR C

SUBB A, #LOW 1000

MOV A, msecond_H

SUBB A, #HIGH 1000

JC L_Main_Loop ;if(msecond < 1000), jmp

MOV msecond_L, #0 ;if(msecond >= 1000)

MOV msecond_H, #0

LCALL F_RTC

LCALL F_DisplayRTC

LJMP L_Main_Loop

F_DisplayRTC:

PUSH B ;B入栈

MOV A, hour

MOV B, #10

DIV AB

MOV LED8, A

MOV LED8+1, B

MOV LED8+2, #DIS_;

MOV A, minute

MOV B, #10

DIV AB

MOV LED8+3, A;

MOV LED8+4, B;

MOV LED8+5, #DIS_;

MOV A, second

MOV B, #10

DIV AB

MOV LED8+6, A;

MOV LED8+7, B;

POP B ;B出栈

RET

F_RTC:

INC second ; second + 1

MOV A, second

CLR C

SUBB A,#60

JC L_QuitRTC ; second >= 60?

MOV second, #0;

INC minute ; minute + 1

MOV A, minute

CLR C

SUBB A,#60

JC L_QuitRTC ; minute >= 60?

MOV minute, #0

INC hour ; hour + 1

MOV A, hour

CLR C

SUBB A,#24

JC L_QuitRTC ; hour >= 24?

MOV hour, #0

L_QuitRTC:

RET

; 显示相关程序

T_Display: ;标准字库

; 0 1 2 3 4 5 6 7 8 9 A B C D E F

DB 03FH,006H,05BH,04FH,066H,06DH,07DH,007H,07FH,06FH,077H,07CH,039H,05EH,079H,071H

; black - H J K L N o P U t G Q r M y

DB 000H,040H,076H,01EH,070H,038H,037H,05CH,073H,03EH,078H,03dH,067H,050H,037H,06EH

; 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. -1

DB 0BFH,086H,0DBH,0CFH,0E6H,0EDH,0FDH,087H,0FFH,0EFH,046H

T_COM:

DB 001H,002H,004H,008H,010H,020H,040H,080H ; 位码

F_Send_595:

PUSH 02H ;R2入栈

MOV R2, #8

L_Send_595_Loop:

RLC A

MOV P_HC595_SER,C

SETB P_HC595_SRCLK

CLR P_HC595_SRCLK

DJNZ R2, L_Send_595_Loop

POP 02H ;R2出栈

RET

F_DisplayScan:

PUSH DPH ;DPH入栈

PUSH DPL ;DPL入栈

PUSH 00H ;R0 入栈

MOV DPTR, #T_COM

MOV A, display_index

MOVC A, @A+DPTR

CPL A

LCALL F_Send_595 ;输出位码

MOV DPTR, #T_Display

MOV A, display_index

ADD A, #LED8

MOV R0, A

MOV A, @R0

MOVC A, @A+DPTR

LCALL F_Send_595 ;输出段码

SETB P_HC595_RCLK

CLR P_HC595_RCLK ; 锁存输出数据

INC display_index

MOV A, display_index

ANL A, #0F8H ; if(display_index >= 8)

JZ L_QuitDisplayScan

MOV display_index, #0; ;8位结束回0

L_QuitDisplayScan:

POP 00H ;R0 出栈

POP DPL ;DPL出栈

POP DPH ;DPH出栈

RET

F_Timer0_Interrupt: ;Timer0 1ms中断函数

PUSH PSW ;PSW入栈

PUSH ACC ;ACC入栈

LCALL F_DisplayScan ; 1ms扫描显示一位

SETB B_1ms ; 1ms标志

POP ACC ;ACC出栈

POP PSW ;PSW出栈

RETI

END