#include <regx51.h> unsigned char x=0; void hien_thi(char x); void main() { while (1) { hien_thi(x); if (P2_7==0) x=x+1; if (x>9) x=0; while (P2_7==0) hien_thi(x); } } void hien_thi(char x) { switch (x) { case 0: P0 = 0x40;break; case 1: P0 = 0x79;break; case 2: P0 = 0x24;break; case 3: P0 = 0x30 ;break; case 4: P0 = 0x19;break; case 5: P0 = 0x12;break; case 6: P0 = 0x02;break; case 7: P0 = 0x78 ;break; case 8: P0 = 0x00;break; case 9: P0 = 0x10 ;break; } }

1. // LED 7 ĐOẠN TĂNG DẦN KHI BẤM
NÚT
#include <REGX51.H>
unsigned char x=0;
void hien_thi(char x);
void main()
{
while (1)
{
hien_thi(x);
if (P2_7==0)
x=x+1;
if (x>9)
x=0;
while (P2_7==0)
hien_thi(x);
}
}
void hien_thi(char x)
{
switch (x)
{
case 0: P0 = 0x40;break;
case 1: P0 = 0x79;break;
case 2: P0 = 0x24;break;
case 3: P0 = 0x30 ;break;
case 4: P0 = 0x19;break;
case 5: P0 = 0x12;break;
case 6: P0 = 0x02;break;
case 7: P0 = 0x78 ;break;
case 8: P0 = 0x00;break;
case 9: P0 = 0x10 ;break;
}
}
// LED 7 ĐOẠN
TĂNG / GIẢM
DẦN KHI BẤM
NÚT
#include
<REGX51.H>
unsigned char
x=0;
void
hien_thi(char x);
void main()
{
while (1)
{
hien_thi(x);
if
(P2_7==0)
x=x+1;
if
(x==10)
x=0;
while
(P2_7==0)
hien_thi(x);
if
(P2_6==0)
x = x -
1;
if (x = = -
1)
x = 9;
while
(P2_6 = = 0)
hien_thi(x);
}
}
void hien_thi(char
x)
{
switch (x)
{
case 0: P0
= 0x40;break;
case 1: P0
= 0x79;break;
case 2: P0
= 0x24;break;
case 3: P0
= 0x30 ;break;
case 4: P0
= 0x19;break;
case 5: P0
= 0x12;break;
case 6: P0
= 0x02;break;
case 7: P0
= 0x78 ;break;
case 8: P0
= 0x00;break;
case 9: P0
= 0x10 ;break;
}
}
1

2. // ĐẾM TIẾN LÙI TỪ
00 ĐẾN 99
#include <reg52x2.h>
#define DVI P3_1
#define CHUC P3_0
#define tang P1_1
#define giam P1_0
delay(int time);
hien_thi(int number);
void main(void)
{
int phim_tang,
phim_giam,sodem,
d_vi,hang_chuc,i;
sodem = 0;
while(1)
{
phim_tang =
tang;
if(phim_tan
g = = 0)
{
sode
m++;
if
(sodem = =100)
sodem=0;
while
(phim_tang = =
0) phim_tang =
tang;
}
phim_giam =
giam;
if(phim_giam =
= 0)
{
sode
m--;
if
(sodem<0)
sodem=0;
while
(phim_giam = =
0) phim_giam =
giam;
}
hang_chuc =
sodem/10;
d_vi = sodem
- (hang_chuc*10);
for
(i=1;i<30;i++)
{
DVI = 1;
CHUC = 0;
hien_thi(d_vi);
}
for
(i=1;i<30;i++)
{
CHUC = 1;
DVI = 0;
hien_thi(hang_chuc);
}}}
hien_thi (int number)
{
switch (number)
{
case 0: P2 =
0x40;break;
case 1: P2 =
0x79;break;
case 2: P2 =
0x24;break;
case 3: P2 =
0x30 ;break;
case 4: P2 =
0x19;break;
case 5: P2 =
0x12;break;
case 6: P2 =
0x02;break;
case 7: P2 =
0x78 ;break;
case 8: P2 =
0x00;break;
case 9: P2 =
0x10 ;break;
}
P2 =
0xff;
}
delay(int time)
{
int k,l;
for(k=1;k<time;
k++)
for(l=1;l<time;l+
+);
}}
#include
<reg52x2.h>
unsigned char i;
void sangdan();
void tatdan();
void delay(long
time);
void
2

3. sang_theo_tung_cap
();
void main()
{
while(1)
{
P2=0x00;
delay(2000);
sangdan();
delay(2000);
tatdan();
delay(2000);
sang_theo_tung_c
ap(); delay(2000);
}
}
void delay(long
time)
{
long t;
for
(t=0;t<=time;t++)
{ }
}
void sangdan( )
{
unsigned char
sangdan[ ] =
{0x01,0x03,0x07,0x0
f,0x1f,0x3f,0x7f,0xff}
;
for (i=0;i<=7;i++)
{
P2=sangdan[i
]; delay(2000);
}
}
void tatdan()
{
unsigned char
sangdan[ ] =
{0x01,0x03,0x07,0
x0f,0x1f,0x3f,0x7f,
0xff};
for
(i=0;i<=7;i++)
{
P2 = ~
sangdan[i];
delay(2000);
}
}
void
sang_theo_tung_ca
p( )
{
unsigned char
sang_theo_tung_ca
p[ ] =
{0x81,0xc3,0xe7,0x
ff};
for (i=0;i<=3;i+
+)
{
P2=sang_theo_tun
g_cap[i];
delay(2000);
}
}
// BÁO ĐỘNG
#include
<reg52x2.h>
#define hoatdong
P1_0
#define n1 P0_0
#define n2 P0_1
#define n3 P0_2
#define n4 P0_3
#define button P3_7
#define baodong
P3_0
void main(void)
{
int phim_hd,
nut_n1,nut_n2,nut_n3,
nut_n4, nut_button;
int dem1,temp;
baodong = 0;
while (1)
{
temp = 0;
phim_hd =
hoatdong;
if ( phim_hd
= = 0 )
{
temp = 1;
baodong = 0;
while ( phim_hd = = 0 )
phim_hd = hoatdong;
}
while (temp= =1)
{
nut_button = button;
if (nut_button = = 1)
baodong = 1;
nut_n1 = n1;
nut_n2 = n2;
nut_n3 = n3;
nut_n4 = n4;
if (nut_n1 == 0)
{
if (dem1= =0) dem1
= 1; else dem1=0;
while (nut_n1 = = 0)
nut_n1 = n1;
}
if (nut_n2 = = 0)
{
3

4. if (dem1= =1) dem1
= 2; else dem1=0;
while (nut_n2 ==
0) nut_n2 = n2;
}
if (nut_n3 = = 0)
{
if (dem1= =2) dem1 =
3; else dem1=0;
while (nut_n3 == 0)
nut_n3 = n3;
}
if (nut_n4 = = 0)
{
if (dem1= =3) dem1
= 4; else dem1=0;
while (nut_n4 = =
0) nut_n4 = n4;
}
if (dem1 = =4)
{baodong = 0;
temp=0; dem1=0;}
}}}
// CHẠY XUỐNG /
LÊN
#include <reg52x2.h>
int luythua (a,b);
void delay (int time);
void main ( )
{
//HIỂN THỊ CHỮ
“T”
#include <reg52x2.h>
#define hang P2
#define cot P3
void main(void)
{ int i,k;
int i,x,t;
t = 1000;
while(1)
{
P2 = 0;
for (i=0; i<8; i++)
{P2 = luythua (2, i);
delay (t);}
for (i=7; i>0; i - -)
{P2 = luythua (2, i);
delay (t);}}}
void delay(int time)
{
int i;
for(i=0;i<time;i++);
}
int luythua(a,b)
{
int x,k;
x = 1;
for(k=0;k<b;k++) x=x*a;
return(x);
}
int gt_hang[8],
gt_cot[8];
for(i = 1;i<9;i++)
gt_cot[i] = 2^(i-1);
gt_cot[1] = 1;
gt_cot[2] = 2;
gt_cot[3] = 4;
gt_cot[4] = 8;
gt_cot[5] = 16;
gt_cot[6] = 32;
gt_cot[7] = 64;
gt_cot[8] = 128;
gt_hang[1]= 0xfc;
gt_hang[2]= 0xfc;
gt_hang[3]= 0xfc;
gt_hang[4]= 0x00;
gt_hang[5]= 0x00;
gt_hang[6]= 0xfc;
gt_hang[7]= 0xfc;
gt_hang[8]= 0xfc;
while(1)
{
for (i=1;i<9;i++)
{
for(k=0;k<10;k++)
{
cot = gt_cot[i]; hang =
gt_hang[i];
}
}
}
}
// ĐẾM TỪ 00 ĐẾN 99 RỒI LẶP LẠI,
12MHz
#include"regx51.h"
#define Led_dv P3_0
#define Led_chuc P3_1
unsigned char
Ma[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x8
2,0xf8,0x80,0x90};
int a, b, c, d, k;
void delay(unsigned long int t)
{
unsigned long int l;
4

5. for(l=0;l<t;l++);
}
void main()
{
int i;
while(1)
{
for(k=0;k<=99;k++)
{
a=k/10;
b=k%10;
for(i=0;i<20;i++)
{
Led_dv=1;
P2=Ma[a];
delay(400);
Led_dv=0;
P2=0xff;//xoa data
Led_chuc=1;
P2=Ma[b];
delay(400);
Led_chuc=0;
P2=0xff;
}
}
}
}
// ĐẾM TỪ 0000 ĐẾN 9999 RỒI
LẶP LẠI, 12MHz
#include<reg51.h>
unsigned char
Ma[10]={0xc0,0xf9,0xa4,0xb0,
0x99,0x92,0x82,0xf8,0x80,0x9
0};
unsigned char
num=0,donvi,chuc,tram,nghin;
void
delay(unsig
ned long int
t)
{
unsigne
d long int l;
for(l=0;l
<t;l++);
}
void DCB(void)
{
nghin=num/1000;
tram=(num%1000)/100;
chuc=(num%100)/10;
donvi=num%10;
}
void HIEN_THI(void)
{
P0=Ma[nghin];
P2=0x1;
delay(130);
P2=0;
P0=0xFF;
P0=Ma[tram];
P2=0x2;
delay(130);
P2=0;
P0=0xFF;
P0=Ma[chuc];
P2=0x4;
delay(130);
P2=0;
P0=0xFF;
P0=Ma[donvi];
P2=0x8;
delay(130);
P2=0;
P0=0xFF;
}
void main(void)
{
while(1)
{
unsigned a;
for(a=0;a<30;a++)
{
DCB();
HIEN_THI(
);
}
num=num+
1;
if (num=
=10000)nu
m=0;
}
}
Đề năm 2013/06/15
5

6. #include <REGX51.H>
unsigned char x=0,y;
void hien_thi_chu(char y);
void hien_thi_so(char x);
void main()
{
while (1)
{
hien_thi_so (x);
if (P3_0==0)
x=x+1;
if (x==10)
x=9;
while (P3_0==0)
{
while (P3_1==0)
{
hien_thi_chu(1);
}
hien_thi_so (x);
}
if (P3_1==0)
x=x-1;
if (x == - 1)
x=0;
while (P3_1 == 0)
{
while (P3_0==0)
{
hien_thi_chu(2);
}
hien_thi_so (x);
}
}
}
void hien_thi_so (char x)
{
switch (x)
{
case 0: P2 = 0x40;break;
case 1: P2 = 0x79;break;
case 2: P2 = 0x24;break;
case 3: P2 = 0x30 ;break;
case 4: P2 = 0x19;break;
case 5: P2 = 0x12;break;
case 6: P2 = 0x02;break;
case 7: P2 = 0x78 ;break;
case 8: P2 = 0x00;break;
case 9: P2 = 0x10 ;break;
}
}
void hien_thi_chu (char y)
{
switch (y)
{
case 1: P2 = 0x08;break;
case 2: P2 = 0x03;break;
}
}
6

7. #include <REGX51.H>
unsigned char x=0,y;
void hien_thi_chu(char y);
void hien_thi_so(char x);
void main()
{
while (1)
{
hien_thi_so (x);
if (P3_0==0)
x=x+1;
if (x==10)
x=9;
while (P3_0==0)
{
while (P3_1==0)
{
hien_thi_chu(1);
}
hien_thi_so (x);
}
if (P3_1==0)
x=x-1;
if (x == - 1)
x=0;
while (P3_1 == 0)
{
while (P3_0==0)
{
hien_thi_chu(2);
}
hien_thi_so (x);
}
}
}
void hien_thi_so (char x)
{
switch (x)
{
case 0: P2 = 0x40;break;
case 1: P2 = 0x79;break;
case 2: P2 = 0x24;break;
case 3: P2 = 0x30 ;break;
case 4: P2 = 0x19;break;
case 5: P2 = 0x12;break;
case 6: P2 = 0x02;break;
case 7: P2 = 0x78 ;break;
case 8: P2 = 0x00;break;
case 9: P2 = 0x10 ;break;
}
}
void hien_thi_chu (char y)
{
switch (y)
{
case 1: P2 = 0x08;break;
case 2: P2 = 0x03;break;
}
}
6