2024年2月20日发(作者：左和璧)
25．
点阵式LED“0－9”数字显示技术
1．实验任务
利用8X8点阵显示数字0到9的数字。
2．电路原理图
图4.25.1
3．硬件系统连线
(1>．
把“单片机系统”区域中的P1端口用8芯排芯连接到“点阵模块”区域中的“DR1－DR8”端口上；
(2>．
把“单片机系统”区域中的P3端口用8芯排芯连接到“点阵模块”区域中的“DC1－DC8”端口上；
1 / 10
4．程序设计内容
(1>．
数字0－9点阵显示代码的形成
如下图所示，假设显示数字“0”
123 45 6 7 8
● ● ●
● ●
● ●
● ●
● ●
● ●
● ● ●
00 00 3E 41 41 41 3E 00
因此，形成的列代码为
00H，00H，3EH，41H，41H，3EH，00H，00H；只要把这些代码分别送到相应的列线上面，即可实现“0”的数字显示。
送显示代码过程如下所示
送第一列线代码到P3端口，同时置第一行线为“0”，其它行线为“1”，延时2ms左右，送第二列线代码到P3端口，同时置第二行线为“0”，其它行线为“1”，延时2ms左右，如此下去，直到送完最后一列代码，又从头开始送。
数字“1”代码建立如下图所示123 45 6 7 8
●
● ●
●
●
●
●
● ● ●
其显示代码为 00H，00H，00H，00H，21H，7FH，01H，00H
数字“2”代码建立如下图所示
2 / 10
123 45 6 7 8
● ● ●
● ●
●
●
● ● ● ●
●
● ● ● ● ●
00H，00H，27H，45H，45H，45H，39H，00H
数字“3”代码建立如下图所示
123 45 6 7 8
● ● ●
● ●
●
● ● ●
●
● ●
● ● ●
00H，00H，22H，49H，49H，49H，36H，00H
数字“4”代码建立如下图所示
123 45 6 7 8
●
● ●
● ●
● ●
● ● ● ● ●
●
●
00H，00H，0CH，14H，24H，7FH，04H，00H
数字“5”代码建立如下图所示
123 45 6 7 8
3 / 10
● ● ● ● ●
●
● ● ● ●
●
●
● ●
● ● ●
00H，00H，72H，51H，51H，51H，4EH，00H
数字“6”代码建立如下图所示
123 45 6 7 8
● ● ●
● ●
●
● ● ● ●
● ●
● ●
● ● ●
00H，00H，3EH，49H，49H，49H，26H，00H
数字“7”代码建立如下图所示
123 45 6 7 8
● ● ● ● ●
●
●
●
●
●
●
00H，00H，40H，40H，40H，4FH，70H，00H
数字“8”代码建立如下图所示
123 45 6 7 8
4 / 10
● ● ●
● ●
● ●
● ● ●
● ●
● ●
● ● ●
00H，00H，36H，49H，49H，49H，36H，00H
数字“9”代码建立如下图所示
123 45 6 7 8
● ● ●
● ●
● ●
● ● ● ●
●
● ●
● ● ●
00H，00H，32H，49H，49H，49H，3EH，00H
5．汇编源程序
TIM EQU 30H
CNTA EQU 31H
CNTB EQU 32H
ORG 00H
LJMP START
ORG 0BH
LJMP T0X
ORG 30H
MOV TIM,#00H
MOV CNTA,#00H
MOV CNTB,#00H
5 / 10
START:
MOV TMOD,#01H
MOV TH0,#(65536-4000>/256
MOV TL0,#(65536-4000> MOD 256
SETB TR0
SETB ET0
SETB EA
SJMP $
T0X:
MOV TH0,#(65536-4000>/256
MOV TL0,#(65536-4000> MOD 256
MOV DPTR,#TAB
MOV A,CNTA
MOVC A,@A+DPTR
MOV P3,A
MOV DPTR,#DIGIT
MOV A,CNTB
MOV B,#8
MUL AB
ADD A,CNTA
MOVC A,@A+DPTR
MOV P1,A
INC CNTA
MOV A,CNTA
CJNE A,#8,NEXT
MOV CNTA,#00H
NEXT: INC TIM
MOV A,TIM
6 / 10
CJNE A,#250,NEX
MOV TIM,#00H
INC CNTB
MOV A,CNTB
CJNE A,#10,NEX
MOV CNTB,#00H
NEX: RETI
TAB: DB 0FEH,0FDH,0FBH,0F7H,0EFH,0DFH,0BFH,07FH
DIGIT:
DB 00H,00H,3EH,41H,41H,41H,3EH,00H
DB 00H,00H,00H,00H,21H,7FH,01H,00H
DB 00H,00H,27H,45H,45H,45H,39H,00H
DB 00H,00H,22H,49H,49H,49H,36H,00H
DB 00H,00H,0CH,14H,24H,7FH,04H,00H
DB 00H,00H,72H,51H,51H,51H,4EH,00H
DB 00H,00H,3EH,49H,49H,49H,26H,00H
DB 00H,00H,40H,40H,40H,4FH,70H,00H
DB 00H,00H,36H,49H,49H,49H,36H,00H
DB 00H,00H,32H,49H,49H,49H,3EH,00H
END
6．C语言源程序
#include
unsigned char code tab[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f}。
unsigned char code digittab[10][8]={
{0x00,0x00,0x3e,0x41,0x41,0x41,0x3e,0x00},
{0x00,0x00,0x00,0x00,0x21,0x7f,0x01,0x00},
//0
//1
7 / 10
{0x00,0x00,0x27,0x45,0x45,0x45,0x39,0x00},
{0x00,0x00,0x22,0x49,0x49,0x49,0x36,0x00},
{0x00,0x00,0x0c,0x14,0x24,0x7f,0x04,0x00},
{0x00,0x00,0x72,0x51,0x51,0x51,0x4e,0x00},
{0x00,0x00,0x3e,0x49,0x49,0x49,0x26,0x00},
{0x00,0x00,0x40,0x40,0x40,0x4f,0x70,0x00},
{0x00,0x00,0x36,0x49,0x49,0x49,0x36,0x00},
{0x00,0x00,0x32,0x49,0x49,0x49,0x3e,0x00} //9
}。
unsigned int timecount。
unsigned char cnta。
unsigned char cntb。
void main(void>
{
TMOD=0x01。
TH0=(65536-3000>/256。
TL0=(65536-3000>%256。
TR0=1。
ET0=1。
8 / 10
//2
//3
//4
//5
//6
//7
//8
EA=1。
while(1>
{。
}
}
void t0(void> interrupt 1 using 0
{
TH0=(65536-3000>/256。
TL0=(65536-3000>%256。
P3=tab[cnta]。
P1=digittab[cntb][cnta]。
cnta++。
if(cnta==8>
{
cnta=0。
}
timecount++。
if(timecount==333>
{
timecount=0。
cntb++。
if(cntb==10>
{
cntb=0。
9 / 10
}
}
}
10 / 10
2024年2月20日发(作者：左和璧)
25．
点阵式LED“0－9”数字显示技术
1．实验任务
利用8X8点阵显示数字0到9的数字。
2．电路原理图
图4.25.1
3．硬件系统连线
(1>．
把“单片机系统”区域中的P1端口用8芯排芯连接到“点阵模块”区域中的“DR1－DR8”端口上；
(2>．
把“单片机系统”区域中的P3端口用8芯排芯连接到“点阵模块”区域中的“DC1－DC8”端口上；
1 / 10
4．程序设计内容
(1>．
数字0－9点阵显示代码的形成
如下图所示，假设显示数字“0”
123 45 6 7 8
● ● ●
● ●
● ●
● ●
● ●
● ●
● ● ●
00 00 3E 41 41 41 3E 00
因此，形成的列代码为
00H，00H，3EH，41H，41H，3EH，00H，00H；只要把这些代码分别送到相应的列线上面，即可实现“0”的数字显示。
送显示代码过程如下所示
送第一列线代码到P3端口，同时置第一行线为“0”，其它行线为“1”，延时2ms左右，送第二列线代码到P3端口，同时置第二行线为“0”，其它行线为“1”，延时2ms左右，如此下去，直到送完最后一列代码，又从头开始送。
数字“1”代码建立如下图所示123 45 6 7 8
●
● ●
●
●
●
●
● ● ●
其显示代码为 00H，00H，00H，00H，21H，7FH，01H，00H
数字“2”代码建立如下图所示
2 / 10
123 45 6 7 8
● ● ●
● ●
●
●
● ● ● ●
●
● ● ● ● ●
00H，00H，27H，45H，45H，45H，39H，00H
数字“3”代码建立如下图所示
123 45 6 7 8
● ● ●
● ●
●
● ● ●
●
● ●
● ● ●
00H，00H，22H，49H，49H，49H，36H，00H
数字“4”代码建立如下图所示
123 45 6 7 8
●
● ●
● ●
● ●
● ● ● ● ●
●
●
00H，00H，0CH，14H，24H，7FH，04H，00H
数字“5”代码建立如下图所示
123 45 6 7 8
3 / 10
● ● ● ● ●
●
● ● ● ●
●
●
● ●
● ● ●
00H，00H，72H，51H，51H，51H，4EH，00H
数字“6”代码建立如下图所示
123 45 6 7 8
● ● ●
● ●
●
● ● ● ●
● ●
● ●
● ● ●
00H，00H，3EH，49H，49H，49H，26H，00H
数字“7”代码建立如下图所示
123 45 6 7 8
● ● ● ● ●
●
●
●
●
●
●
00H，00H，40H，40H，40H，4FH，70H，00H
数字“8”代码建立如下图所示
123 45 6 7 8
4 / 10
● ● ●
● ●
● ●
● ● ●
● ●
● ●
● ● ●
00H，00H，36H，49H，49H，49H，36H，00H
数字“9”代码建立如下图所示
123 45 6 7 8
● ● ●
● ●
● ●
● ● ● ●
●
● ●
● ● ●
00H，00H，32H，49H，49H，49H，3EH，00H
5．汇编源程序
TIM EQU 30H
CNTA EQU 31H
CNTB EQU 32H
ORG 00H
LJMP START
ORG 0BH
LJMP T0X
ORG 30H
MOV TIM,#00H
MOV CNTA,#00H
MOV CNTB,#00H
5 / 10
START:
MOV TMOD,#01H
MOV TH0,#(65536-4000>/256
MOV TL0,#(65536-4000> MOD 256
SETB TR0
SETB ET0
SETB EA
SJMP $
T0X:
MOV TH0,#(65536-4000>/256
MOV TL0,#(65536-4000> MOD 256
MOV DPTR,#TAB
MOV A,CNTA
MOVC A,@A+DPTR
MOV P3,A
MOV DPTR,#DIGIT
MOV A,CNTB
MOV B,#8
MUL AB
ADD A,CNTA
MOVC A,@A+DPTR
MOV P1,A
INC CNTA
MOV A,CNTA
CJNE A,#8,NEXT
MOV CNTA,#00H
NEXT: INC TIM
MOV A,TIM
6 / 10
CJNE A,#250,NEX
MOV TIM,#00H
INC CNTB
MOV A,CNTB
CJNE A,#10,NEX
MOV CNTB,#00H
NEX: RETI
TAB: DB 0FEH,0FDH,0FBH,0F7H,0EFH,0DFH,0BFH,07FH
DIGIT:
DB 00H,00H,3EH,41H,41H,41H,3EH,00H
DB 00H,00H,00H,00H,21H,7FH,01H,00H
DB 00H,00H,27H,45H,45H,45H,39H,00H
DB 00H,00H,22H,49H,49H,49H,36H,00H
DB 00H,00H,0CH,14H,24H,7FH,04H,00H
DB 00H,00H,72H,51H,51H,51H,4EH,00H
DB 00H,00H,3EH,49H,49H,49H,26H,00H
DB 00H,00H,40H,40H,40H,4FH,70H,00H
DB 00H,00H,36H,49H,49H,49H,36H,00H
DB 00H,00H,32H,49H,49H,49H,3EH,00H
END
6．C语言源程序
#include
unsigned char code tab[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f}。
unsigned char code digittab[10][8]={
{0x00,0x00,0x3e,0x41,0x41,0x41,0x3e,0x00},
{0x00,0x00,0x00,0x00,0x21,0x7f,0x01,0x00},
//0
//1
7 / 10
{0x00,0x00,0x27,0x45,0x45,0x45,0x39,0x00},
{0x00,0x00,0x22,0x49,0x49,0x49,0x36,0x00},
{0x00,0x00,0x0c,0x14,0x24,0x7f,0x04,0x00},
{0x00,0x00,0x72,0x51,0x51,0x51,0x4e,0x00},
{0x00,0x00,0x3e,0x49,0x49,0x49,0x26,0x00},
{0x00,0x00,0x40,0x40,0x40,0x4f,0x70,0x00},
{0x00,0x00,0x36,0x49,0x49,0x49,0x36,0x00},
{0x00,0x00,0x32,0x49,0x49,0x49,0x3e,0x00} //9
}。
unsigned int timecount。
unsigned char cnta。
unsigned char cntb。
void main(void>
{
TMOD=0x01。
TH0=(65536-3000>/256。
TL0=(65536-3000>%256。
TR0=1。
ET0=1。
8 / 10
//2
//3
//4
//5
//6
//7
//8
EA=1。
while(1>
{。
}
}
void t0(void> interrupt 1 using 0
{
TH0=(65536-3000>/256。
TL0=(65536-3000>%256。
P3=tab[cnta]。
P1=digittab[cntb][cnta]。
cnta++。
if(cnta==8>
{
cnta=0。
}
timecount++。
if(timecount==333>
{
timecount=0。
cntb++。
if(cntb==10>
{
cntb=0。
9 / 10
}
}
}
10 / 10