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经典电子钟!!!带仿真效果图!!:
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这是一个经典的电子钟,用数码管设计
实验任务
(1. 开机时,显示12:00:00的时间开始计时;
(2. P0.0/AD0控制“秒”的调整,每按一次加1秒;
(3. P0.1/AD1控制“分”的调整,每按一次加1分;
(4. P0.2/AD2控制“时”的调整,每按一次加1个小时;
C语言源程序
#include <AT89X51.H>
unsignedcharcodedispcode[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};
unsigned char dispbitcode[]={0xfe,0xfd,0xfb,0xf7, 0xef,0xdf,0xbf,0x7f};
unsigned char dispbuf[8]={0,0,16,0,0,16,2,1}; //初始化使显示时间的位全为12:00:00,其他都不点亮;
当将dispbitcode[2] 和dispbitcode[3]对应的16改为X(10~15中的一个),并将其指向dispcode[16]即0x00改为dispcode[X]即0x40。时分秒的间隔就为“—”。
unsigned char dispbitcnt;
unsigned char second;
unsigned char minite;
unsigned char hour;
unsigned int tcnt;
unsigned char mstcnt;
unsigned char i,j;
void main(void)
{
TMOD=0x02;
TH0=0x06;
TL0=0x06;
TR0=1;
ET0=1;
EA=1;
hour=12;
while(1)
{
if(P0_0==0)
{
for(i=5;i>0;i--)
for(j=248;j>0;j--);
if(P0_0==0)
{
second++;
if(second==60)
{
second=0;
}
dispbuf[0]=second%10;
dispbuf[1]=second/10;
while(P0_0==0);
}
}
if(P0_1==0)
{
for(i=5;i>0;i--)
for(j=248;j>0;j--);
if(P0_1==0)
{
minite++;
if(minite==60)
{
minite=0;
}
dispbuf[3]=minite%10;
dispbuf[4]=minite/10;
while(P0_1==0);
}
}
if(P0_2==0)
{
for(i=5;i>0;i--)
for(j=248;j>0;j--);
if(P0_2==0)
{
hour++;
if(hour==24)
{
hour=0;
}
dispbuf[6]=hour%10;
dispbuf[7]=hour/10;
while(P0_2==0);
}
}
}
}
void t0(void) interrupt 1 using 0
{
mstcnt++;
if(mstcnt==8)
{
mstcnt=0;
P3=0xff; //关闭所有显示
P1=dispcode[dispbuf[dispbitcnt]];
P3=dispbitcode[dispbitcnt];
dispbitcnt++;
if(dispbitcnt==8)
{
dispbitcnt=0;
}
}
tcnt++;
if(tcnt==4000)
{
tcnt=0;
second++;
if(second==60)
{
second=0;
minite++;
if(minite==60)
{
minite=0;
hour++;
if(hour==24)
{
hour=0;
}
}
}
dispbuf[0]=second%10;
dispbuf[1]=second/10;
dispbuf[3]=minite%10;
dispbuf[4]=minite/10;
dispbuf[6]=hour%10;
dispbuf[7]=hour/10;
}
}
汇编源程序
SECOND EQU 30H
MINITE EQU 31H
HOUR EQU 32H
HOURK BIT P0.2
MINITEK BIT P0.1
SECONDK BIT P0.0
DISPBUF EQU 40H
DISPBIT EQU 48H
T2SCNTA EQU 49H
T2SCNTB EQU 4AH
TEMP EQU 4BH

ORG 00H
LJMP START
ORG 0BH
LJMP INT_T0
START: MOV SECOND,#00H
MOV MINITE,#00H
MOV HOUR,#12
MOV DISPBIT,#00H
MOV T2SCNTA,#00H
MOV T2SCNTB,#00H
MOV TEMP,#0FEH
LCALL DISP ;2KB范围内长调用
MOV TMOD,#01H
MOV TH0,#(65536-2000) / 256 ;2ms
MOV TL0,#(65536-2000) MOD 256
SETB TR0
SETB ET0
SETB EA
WT: JB SECONDK,NK1 ;SECONDK是1转NK1,即按键SP1按下时转.
LCALL DELY10MS
JB SECONDK,NK1
INC SECOND
MOV A,SECOND
CJNE A,#60,NS60
MOV SECOND,#00H
NS60: LCALL DISP
JNB SECONDK,$
NK1: JB MINITEK,NK2
LCALL DELY10MS
JB MINITEK,NK2
INC MINITE
MOV A,MINITE
CJNE A,#60,NM60
MOV MINITE,#00H
NM60: LCALL DISP
JNB MINITEK,$
NK2: JB HOURK,NK3
LCALL DELY10MS
JB HOURK,NK3
INC HOUR
MOV A,HOUR
CJNE A,#24,NH24
MOV HOUR,#00H
NH24: LCALL DISP
JNB HOURK,$
NK3: LJMP WT
DELY10MS:
MOV R6,#10
D1: MOV R7,#248
DJNZ R7,$
DJNZ R6,D1
RET
DISP: ;将得出的时间存入40H (DISPBUF)之后的地址
MOV A,#DISPBUF
ADD A,#8
DEC A
MOV R1,A
MOV A,HOUR
MOV B,#10
DIV AB
MOV @R1,A ;累加器送内部RAM单元
@R1与R1区分?:@R1——R1为地址,@R1指向其内容。
R1 ——R1为变量,
DEC R1
MOV A,B
MOV @R1,A
DEC R1
MOV A,#10 ;输出符号“—”
MOV@R1,A
DEC R1
MOV A,MINITE
MOV B,#10
DIV AB
MOV @R1,A
DEC R1
MOV A,B
MOV @R1,A
DEC R1
MOV A,#10
MOV@R1,A
DEC R1
MOV A,SECOND
MOV B,#10
DIV AB
MOV @R1,A
DEC R1
MOV A,B
MOV @R1,A
DEC R1
RET
INT_T0:
MOV TH0,#(65536-2000) / 256
MOV TL0,#(65536-2000) MOD 256
MOV A, #0FFH
MOV P3,A
MOV A,#DISPBUF
ADD A,DISPBIT ;地址加,并将时间的各位送到P1。
MOV R0,A
MOV A,@R0
MOV DPTR,#TABLE
MOVC A,@A+DPTR
MOV P1,A
MOV A,DISPBIT
MOV DPTR,#TAB
MOVC A,@A+DPTR
MOV P3,A
INC DISPBIT
MOV A,DISPBIT
CJNE A,#08H,KNA
MOV DISPBIT,#00H
KNA: INC T2SCNTA ;******时间的增加与进位******
MOV A,T2SCNTA
CJNE A,#100,DONE
MOV T2SCNTA,#00H
INC T2SCNTB
MOV A,T2SCNTB
CJNE A,#05H,DONE
MOV T2SCNTB,#00H
INC SECOND
MOV A,SECOND
CJNE A,#60,NEXT
MOV SECOND,#00H
INC MINITE
MOV A,MINITE
CJNE A,#60,NEXT
MOV MINITE,#00H
INC HOUR
MOV A,HOUR
CJNE A,#24,NEXT
MOV HOUR,#00H
NEXT: LCALL DISP
DONE: RETI
TABLE: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH,40H ;40H代表符号“—”
TAB: DB 0FEH,0FDH,0FBH,0F7H,0EFH,0DFH,0BFH,07FH
END


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