AT89C51单片机利用定时器|计数器T0产生1秒钟的定时，每当一秒定时到来时，更换指示灯点亮，依次循环点亮 用at89c51单片机的定时/计数器T0产生1秒的定时
\u7528AT89C51\u7684\u5b9a\u65f6/\u8ba1\u6570\u5668T0\u4ea7\u751f2\u79d2\u949f\u7684\u5b9a\u65f6\uff0c\u6bcf\u5f532\u79d2\u5b9a\u65f6\u5230\u6765\u65f6\uff0c\u66f4\u6362\u6307\u793a\u706f\u95ea\u70c1\uff0c\u6bcf\u4e2a\u6307\u793a\u95ea\u70c1\u7684\u9891\u7387\u4e3a0.2//\u6211\u5012\uff0c\u5199\u5b8c\u8c03\u8bd5\u597d\uff0c\u624d\u53d1\u73b0\u4f60\u8981\u7684\u662f\u6c47\u7f16\uff0c\u7b97\u4e86\uff0c\u4e0d\u5199\u4e86\uff0c\u5206\u7559\u7ed9\u522b\u4eba\u5427\uff0c\u4e0d\u662f\u592a\u96be\u7684\u9898\u3002
#include
#include
#define uchar unsigned char
#define L1 PD0
#define L2 PD1
uchar light_change=0x01;
void MCU_init(void)
{
DDRD=0xff;
PORTD=0xff;
}
void timer0_init(void)
{
TCNT0=158;
TCCR0=0x05;
TIMSK|=(1<<TOIE0);
}
ISR(TIMER0_OVF_vect)
{
static uchar cnt=0;
TCNT0=158;
if(++cnt>=20)
{
cnt=0;
light_change^=0x01;
PORTD=0xff;
}
if(light_change)PORTD^=(1<<L1);
else PORTD^=(1<<L2);
}
int main(void)
{
MCU_init();
timer0_init();
sei();
while(1);
}
\u53c2\u8003\u8fd9\u4e2a\uff1a
#include
#include
#define uchar unsigned char
#define uint unsigned int
uchar Count;
sbit Dot = P0^7;
uchar code DSY_CODE[]=
{
0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f
};
uchar Digits_of_6DSY[]={0,0,0,0,0,0};
void DelayMS(uint x)
{
uchar i;
while(--x)
{
for(i=0;i<120;i++);
}
}
void main()
{
uchar i,j;
P0 = 0x00;
P3 = 0xff;
Count =0;
TMOD = 0x01;
TH0 = (65535-50000)/256;
TL0 = (65535-50000)%256;
IE = 0x82;
TR0 = 1;
while(1)
{
j = 0x7f;
for(i=5;i!=-1;i--)
{
j=_crol_(j,1);
P3 = j;
P0 = DSY_CODE[Digits_of_6DSY[i]];
if(i==1) P0 |= 0x80;
DelayMS(2);
}
}
}
void Time0() interrupt 1
{
uchar i;
TH0 = (65535-50000)/256;
TL0 = (65535-50000)%256;
if(++Count !=2) return;
Count = 0;
Digits_of_6DSY[0]++;
for(i=0;i<=5;i++)
{
if(Digits_of_6DSY[i] == 10)
{
Digits_of_6DSY[i] = 0;
if(i != 5) Digits_of_6DSY[i+1]++;
}
else break;
}
}
;仿照例7.11
;TC=M-T/T计数=9E58H(其中T=25ms)
ORG 0000H
LJMP MAIN
ORG 000BH
AJMP BRT0
ORG 0030H
MAIN:
CLR P1
MOV TMOD,#01H;T0为方式1
SETB EA
SETB ET0
SETB TR0
MOV TH0,#9EH
MOV TL0,#58H
MOV R0,#04H
MOV A,#01H
LOOP:SJMP $;等待中断
ORG 0080H
BRT0:
DJNZ R0,NEXT
MOV P1,A
RL A
MOV R0,#04H
NEXT:MOV TH0,#9EH
MOV TL0,#58H
RETI
END
初始化T0定时50MS，设个计数变量，每定时到了进中断一次+1，加到20次时就是1S，然后更换指示灯点亮，下1S 依次循环点亮。
void main(void)
{
TMOD=0x01; //16位定时模式
TH0=(65536-50000) >> 8;
TL0=(65536-50000) & 255;
TR0=1;
ET0=1;
EA=1;
while(1) ;
}
void timer0() interrupt 1
{
static unsigned char t ,Light = 1;
TF0=0;
if(++t==20)
{
t=0;
//这里加入流水灯程序
P0 = Light;
if(Light > 0x80)Light = 1;
else Light << 1;
}
//重装定时器
TH0=(65536-50000) >> 8;
TL0=(65536-50000) & 255;
}
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绛旓細TMOD=0x01; //璁剧疆瀹氭椂鍣0宸ヤ綔鏂瑰紡01 TH0=(65536-45872)/256; //瑁呭垵鍊11.0592鏅舵尟瀹氭椂50ms TL0=(65536-45872)%256;EA=1;ET0=1;TR0=1;} void TO_time() interrupt 1 { TH0=(65536-45872)/256; //瑁呭垵鍊11.0592鏅舵尟瀹氭椂50ms TL0=(65536-45872)%256;num0++;if(40==num0) ...
绛旓細include <reg51.H> sbit P3_5 =P3^5;void delay(){ unsigned char i,j;for(j=20;j>0;j--)for( i= 250;i>0;i--);} unsigned char code dispcode[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E,0x00};unsigned char second...
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绛旓細AT89C51鍗曠墖鏈 鍒╃敤瀹氭椂鍣T0鏂瑰紡1 ORG 0000H AJMP MAIN ORG 000BH AJMP T0INT ORG 0100H MAIN: MOV TMOD , #01H MOV TH0 , #0FFH MOV TL0 , #06H MOV IE , #82H SETB TR0 SJMP T0INT: CPL P1.0 MOV TH0 , #0FFH MOV TL0 , #06H RETI END ...
绛旓細sbit P1_0=P1^0;//浣嶅畾涔 unsigned char i; //瀹氫箟鍙橀噺 void main(void){ P1_0=0;TMOD=0x01; //T0瀹氭椂鍣锛屽伐浣滄柟寮1 TH0=(65536-500)/256;TL0=(65536-500)%256; //瑁呭垵鍊 ET0=1;EA=1;TR0=1;while (1) ;} void time0 () interrupt 1 //浣跨敤涓柇鏂瑰紡1 { TH0=(...
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