at89s51.c

35个51单片机使用的c51程序

MOVC A,@A+DPTR 
CJNE A,#01H,LOOP1 
JMP START 
LOOP1: MOV P1,A 
MOV R3,#20 
LCALL DELAY 
INC DPTR 
JMP LOOP 
DELAY: MOV R4,#20 
D1: MOV R5,#248 
DJNZ R5,$ 
DJNZ R4,D1 
DJNZ R3,DELAY 
RET 
AT89S51单片机实验及实践教程 www.supermcu.com 
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TABLE: DB 0FEH,0FDH,0FBH,0F7H 
DB 0EFH,0DFH,0BFH,07FH 
DB 0FEH,0FDH,0FBH,0F7H 
DB 0EFH,0DFH,0BFH,07FH 
DB 07FH,0BFH,0DFH,0EFH 
DB 0F7H,0FBH,0FDH,0FEH 
DB 07FH,0BFH,0DFH,0EFH 
DB 0F7H,0FBH,0FDH,0FEH 
DB 00H, 0FFH,00H, 0FFH 
DB 01H 
END 
7. C语言源程序 
#include 
unsigned char code table[]={0xfe,0xfd,0xfb,0xf7, 
0xef,0xdf,0xbf,0x7f, 
0xfe,0xfd,0xfb,0xf7, 
0xef,0xdf,0xbf,0x7f, 
0x7f,0xbf,0xdf,0xef, 
0xf7,0xfb,0xfd,0xfe, 
0x7f,0xbf,0xdf,0xef, 
0xf7,0xfb,0xfd,0xfe, 
0x00,0xff,0x00,0xff, 
0x01}; 
unsigned char i; 
void delay(void) 
{ 
unsigned char m,n,s; 
for(m=20;m>0;m--) 
for(n=20;n>0;n--) 
for(s=248;s>0;s--); 
} 
void main(void) 
{ 
while(1) 
{ 
if(table[i]!=0x01) 
{ 
P1=table[i]; 
i++; 
delay(); 
} 
else 
{ 
i=0; 
} 
} 
} 
6. 报警产生器 
1. 实验任务 
用P1.0输出1KHz和500Hz的音频信号驱动扬声器,作报警信号,要求1KHz信号响100ms,500Hz
信号响200ms,交替进行,P1.7接一开关进行控制,当开关合上响报警信号,当开关断开告警信号停止,
编出程序. 
AT89S51I /'? ZZZVXSHUPFXFRP
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500us 1 × 
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AT89S51单片机实验及实践教程 www.supermcu.com 
- 41 - 
图4.6.2 
6. 汇编源程序 
FLAG BIT 00H 
ORG 00H 
START: JB P1.7,START 
JNB FLAG,NEXT 
MOV R2,#200 
DV: CPL P1.0 
LCALL DELY500 
LCALL DELY500 
DJNZ R2,DV 
CPL FLAG 
NEXT: MOV R2,#200 
DV1: CPL P1.0 
LCALL DELY500 
DJNZ R2,DV1 
CPL FLAG 
SJMP START 
DELY500: MOV R7,#250 
LOOP: NOP 
DJNZ R7,LOOP 
RET 
END 
7. C语言源程序 
#include 
#include 
bit flag; 
unsigned char count; 
开始 
K1按下了吗 
FLAG=0吗 
置200次计数 
P1.0输出取反 
延时500us 
计数值计完了吗 
FLAG取反 
置200次计数 
P1.0输出取反
延时1ms 
计数值计完了吗 
FLAG取反 
AT89S51单片机实验及实践教程 www.supermcu.com 
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void dely500(void) 
{ 
unsigned char i; 
for(i=250;i>0;i--) 
{ 
_nop_(); 
} 
} 
void main(void) 
{ 
while(1) 
{ 
if(P1_7==0) 
{ 
for(count=200;count>0;count--) 
{ 
P1_0=~P1_0; 
dely500(); 
} 
for(count=200;count>0;count--) 
{ 
P1_0=~P1_0; 
dely500(); 
dely500(); 
} 
} 
} 
} 
7. I/O并行口直接驱动LED显示 
1. 实验任务 
如图13所示,利用AT89S51单片机的P0端口的P0.0-P0.7连接到一个共阴数码管的a-h的笔段上,
数码管的公共端接地.在数码管上循环显示0-9数字,时间间隔0.2秒. 
2. 电路原理图 
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c, E ¨¨P0.7/AD7 h, E ~ 
/: @í@―? 
~1 LEDD- /s) 
×! LED/<
V / TABLEDB3FH¨06H¨5BH¨4FH¨66H¨6DH¨7DH¨07H¨7FH¨6FH 
AT89S51I /'? ZZZVXSHUPFXFRP
- 44 - 
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4.7.2 
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ORG 0 
START: MOV R1,#00H 
NEXT: MOV A,R1 
MOV DPTR,#TABLE 
MOVC A,@A+DPTR 
MOV P0,A 
LCALL DELAY 
INC R1 
CJNE R1,#10,NEXT 
LJMP START 
DELAY: MOV R5,#20 
D2: MOV R6,#20 
D1: MOV R7,#248 
DJNZ R7,$ 
DJNZ R6,D1 
DJNZ R5,D2 
RET 
TABLE: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH 
END 
U & A /# /: 
#include 
unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66, 
0x6d,0x7d,0x07,0x7f,0x6f}; 
unsigned char dispcount; 
void delay02s(void) 
{ 
unsigned char i,j,k; 
for(i=20;i>0;i--) 
for(j=20;j>0;j--) 
for(k=248;k>0;k--); 
} 
AT89S51I /'? ZZZVXSHUPFXFRP
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void main(void) 
{ 
while(1) 
{ 
for(dispcount=0;dispcount 
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AT89S51单片机实验及实践教程 www.supermcu.com 
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图4.8.4 
6. 汇编源程序 
ORG 0 
START: MOV R1,#00H ;初始化R7为0,表示从0开始计数 
MOV A,R1 ; 
CPL A ;取反指令 
MOV P1,A ;送出P1端口由发光二极管显示 
REL: JNB P3.7,REL ;判断SP1是否按下 
LCALL DELAY10MS ;若按下,则延时10ms左右 
JNB P3.7,REL ;再判断SP1是否真得按下 
INC R7 ;若真得按下,则进行按键处理,使 
MOV A,R7 ;计数内容加1,并送出P1端口由 
CPL A ;发光二极管显示 
MOV P1,A ; 
JNB P3.7,$ ;等待SP1释放 
SJMP REL ;继续对K1按键扫描 
DELAY10MS: MOV R6,#20 ;延时10ms子程序 
L1: MOV R7,#248 
DJNZ R7,$ 
DJNZ R6,L1 
RET 
END 
7. C语言源程序 
#include 
unsigned char count; 
void delay10ms(void) 
{ 
unsigned char i,j; 
for(i=20;i>0;i--) 
for(j=248;j>0;j--); 
} 
void main(void) 
{ 
while(1) 
{ 
if(P3_7==0) 
{ 
delay10ms(); 
if(P3_7==0) 
{ 
count++; 
if(count==16) 
{ 
count=0; 
} 
P1=~count; 
while(P3_7==0); 
} 
} 
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AT89S51I /'? ZZZVXSHUPFXFRP
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ID EQU 30H 
SP1 BIT P3.7 
L1 BIT P1.0 
L2 BIT P1.1 
L3 BIT P1.2 
L4 BIT P1.3 
ORG 0 
MOV ID,#00H 
START: JB K1,REL 
LCALL DELAY10MS 
JB K1,REL 
INC ID 
MOV A,ID 
CJNE A,#04,REL 
MOV ID,#00H 
REL: JNB K1,$ 
MOV A,ID 
CJNE A,#00H,IS0 
CPL L1 
LCALL DELAY 
SJMP START 
AT89S51单片机实验及实践教程 www.supermcu.com 
- 50 - 
IS0: CJNE A,#01H,IS1 
CPL L2 
LCALL DELAY 
SJMP START 
IS1: CJNE A,#02H,IS2 
CPL L3 
LCALL DELAY 
SJMP START 
IS2: CJNE A,#03H,IS3 
CPL L4 
LCALL DELAY 
SJMP START 
IS3: LJMP START 
DELAY10MS: MOV R6,#20 
LOOP1: MOV R7,#248 
DJNZ R7,$ 
DJNZ R6,LOOP1 
RET 
DELAY: MOV R5,#20 
LOOP2: LCALL DELAY10MS 
DJNZ R5,LOOP2 
RET 
END 
7. C语言源程序 
#include 
unsigned char ID; 
void delay10ms(void) 
{ 
unsigned char i,j; 
for(i=20;i>0;i--) 
for(j=248;j>0;j--); 
} 
void delay02s(void) 
{ 
unsigned char i; 
for(i=20;i>0;i--) 
{delay10ms(); 
} 
} 
void main(void) 
{ while(1) 
{ if(P3_7==0) 
{delay10ms(); 
if(P3_7==0) 
{ 
ID++; 
if(ID==4) 
{ 
ID=0; 
} 
while(P3_7==0); 
} 
} 
switch(ID) 
{ case 0: 
P1_0=~P1_0; 
AT89S51I /'? ZZZVXSHUPFXFRP
- 51 - 
delay02s(); 
break; 
case 1: 
P1_1=~P1_1; 
delay02s(); 
break; 
case 2: 
P1_2=~P1_2; 
delay02s(); 
break; 
case 3: 
P1_3=~P1_3; 
delay02s(); 
break; 
} 
} 
} 
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Count EQU 30H 
SP1 BIT P3.7 
ORG 0 
START: MOV Count,#00H 
NEXT: MOV A,Count 
MOV B,#10 
DIV AB 
MOV DPTR,#TABLE 
MOVC A,@A+DPTR 
MOV P0,A 
MOV A,B 
MOVC A,@A+DPTR 
MOV P2,A 
WT: JNB SP1,WT 
WAIT: JB SP1,WAIT 
LCALL DELY10MS 
JB SP1,WAIT 
INC Count 
MOV A,Count 
CJNE A,#100,NEXT 
LJMP START 
DELY10MS: MOV R6,#20 
AT89S51单片机实验及实践教程 www.supermcu.com 
- 53 - 
D1: MOV R7,#248 
DJNZ R7,$ 
DJNZ R6,D1 
RET 
TABLE: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH 
END 
7. C语言源程序 
#include 
unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66, 
0x6d,0x7d,0x07,0x7f,0x6f}; 
unsigned char Count; 
void delay10ms(void) 
{ 
unsigned char i,j; 
for(i=20;i>0;i--) 
for(j=248;j>0;j--); 
} 
void main(void) 
{ 
Count=0; 
P0=table[Count/10]; 
P2=table[Count%10]; 
while(1) 
{ 
if(P3_7==0) 
{ 
delay10ms(); 
if(P3_7==0) 
{ 
Count++; 
if(Count==100) 
{ 
Count=0; 
} 
P0=table[Count/10]; 
P2=table[Count%10]; 
while(P3_7==0); 
} 
} 
} 
} 
11. 00-59秒计时器(利用软件延时) 
1. 实验任务 
如下图所示,在AT89S51单片机的P0和P2端口分别接有两个共阴数码管,P0口驱动显示秒时间的
十位,而P2口驱动显示秒时间的个位. 
2. 电路原理图 
AT89S51I /'? ZZZVXSHUPFXFRP
- 54 - 
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DELY1S: MOV R5,#100 
D2: MOV R6,#20 
D1: MOV R7,#248 
DJNZ R7,$ 
DJNZ R6,D1 
DJNZ R5,D2 
RET 
5U /: u-
AT89S51单片机实验及实践教程 www.supermcu.com 
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图4.11.2 
6. 汇编源程序 
Second EQU 30H 
ORG 0 
START: MOV Second,#00H 
NEXT: MOV A,Second 
MOV B,#10 
DIV AB 
MOV DPTR,#TABLE 
MOVC A,@A+DPTR 
MOV P0,A 
MOV A,B 
MOVC A,@A+DPTR 
MOV P2,A 
LCALL DELY1S 
INC Second 
MOV A,Second 
CJNE A,#60,NEXT 
LJMP START 
DELY1S: MOV R5,#100 
D2: MOV R6,#20 
D1: MOV R7,#248 
DJNZ R7,$ 
DJNZ R6,D1 
DJNZ R5,D2 
RET 
TABLE: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH 
END 
7. C语言源程序 
#include 
unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66, 
0x6d,0x7d,0x07,0x7f,0x6f}; 
unsigned char Second; 
void delay1s(void) 
{ 
unsigned char i,j,k; 
AT89S51单片机实验及实践教程 www.supermcu.com 
- 56 - 
for(k=100;k>0;k--) 
for(i=20;i>0;i--) 
for(j=248;j>0;j--); 
} 
void main(void) 
{ 
Second=0; 
P0=table[Second/10]; 
P2=table[Second%10]; 
while(1) 
{ 
delay1s(); 
Second++; 
if(Second==60) 
{ 
Second=0; 
} 
P0=table[Second/10]; 
P2=table[Second%10]; 
} 
} 
12. 可预置可逆4位计数器 
1. 实验任务 
利用AT89S51单片机的P1.0-P1.3接四个发光二极管L1-L4,用来指示当前计数的数据;用P1.4-
P1.7作为预置数据的输入端,接四个拨动开关K1-K4,用P3.6/WR和P3.7/RD端口接两个轻触开关,
用来作加计数和减计数开关.具体的电路原理图如下图所示 
2. 电路原理图 
AT89S51I /'? ZZZVXSHUPFXFRP
- 57 - 

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AT89S51I /'? ZZZVXSHUPFXFRP
- 58 - 
~ LEDEg /
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6U !v4E# /: 
COUNT EQU 30H 
ORG 00H 
START: MOV A,P3