第1个回答 2010-11-26
#include<reg52.h> // 包含51单片机寄存器定义的头文件
unsigned char code Tab[11]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff};
//数码管显示0~9的段码表
unsigned char int_time; //记录中断次数
unsigned char second; //储存秒
/***********************************************************************
函数功能:快速动态扫描延时,延时约0.6毫秒
************************************************************************/
void delay(void)
{
unsigned char i;
for(i=0;i<200;i++)
;
}
/***********************************************************************
函数功能:显示秒
入口参数:k
出口参数:无
************************************************************************/
void DisplaySecond(unsigned char k)
{
P2=0xbf; //P2.6引脚输出低电平, DS6点亮
P0=Tab[k/10]; //显示十位
delay();
delay();
delay();
delay();
delay();
delay();
delay();
delay();
P2=0x7f; //P2.7引脚输出低电平, DS7点亮
P0=Tab[k%10]; //显示个位
delay();
delay();
delay();
delay();
delay();
delay();
delay();
delay();
P2=0xff; //关闭所有数码管
P0=0xff; //显示个位
delay();
delay();
delay();
delay();
delay();
delay();
delay();
delay();
}
void main(void) //主函数
{
TMOD=0x01; //使用定时器T0
TH0=(65536-46083)/256; //将定时器计时时间设定为46083×1.085微秒
//=50000微秒=50毫秒
TL0=(65536-46083)%256;
EA=1; //开启总中断
ET0=1; //定时器T0中断允许
TR0=1; //启动定时器T0开始运行
int_time=0; //中断次数初始化
second=0; //秒初始化
while(1)
{
DisplaySecond(second); //调用秒的显示子程序
}
}
//********************************************************
//函数功能:定时器T0的中断服务程序
//*******************************************************
void interserve(void ) interrupt 1 using 1
{
TR0=0; //关闭定时器T0
int_time ++; //每来一次中断,中断次数int_time自加1
if(int_time==20) //够20次中断,即1秒钟进行一次检测结果采样
{
int_time=0; //中断次数清0
second++; //秒加1
if(second==60)
second =0; //秒等于60就返回0
}
TH0=(65536-46083)/256; //重新给计数器T0赋初值
TL0=(65536-46083)%256;
TR0=1; //启动定时器T0
}
第2个回答 2010-11-28
ORG 0000H
START:MOV R0,#30
MOV DPTR,#TABLE
LOOP: LCALL DISPLAY
EDC R0
CJNE R0,#100,LOOP
DISPLAY: MOV A,R0
MOV B,#10
DIV AB
MOV R1,A
MOV R2,B
MOV R3,#50
LOOP1: MOV A,R2
LCALL CHANGE
CLR P3.1
LCALL DELAY
SETB P3.1
MOV A,R1
LCALL CHANGE
CLR P3.0
LCALL DELAY
SETB P3.0
CLR A
DJNZ R3,LOOP1
CHANGE: MOVC A,@A+DPTR
MOV P0,A
RET
DELAY: ;10ms延时
MOV R6,#20
D1: MOV R7,#248
DJNZ R7,$
DJNZ R6,D1
RET
TABLE: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH
END
说明:P0口接数码管 p3.0 p3.1为位选本回答被提问者采纳
第3个回答 2010-11-23
#include<reg51.h>
typedef unsigned char uchar;
typedef unsigned int uint;
sbit ioResetCountValue = P1^0; //Reset gucInc/DecTimeValue
sbit ioChooseIncStatus = P1^1; //This Key Tell System it's Inc Order
sbit ioChooseDecStatus = P1^2; //This Key Tell System it's Dec Order
#define mTimerValue 50000 //50ms
uchar data gucIncTimeValue = 0;
uchar data gucDecTimeValue = 60;
uchar data guc50ms = 0;
bit bdata gbIncOder = 1; //ResetValue is 1,means it's Inc Order
void InitialSys(void) { //System Initial SubFuction
TMOD = 0x01; //TImer0 is 16bits Timer
TH0 = (65536 - mTimerValue) / 256;
TL0 = (65536 - mTimerValue) % 256;
TR0 = 1; //Do strat Timer0
EA = 1; //Open Final Interrupt Swith
ET0 = 1; //Open Timer0 Interrupt Switch
}
void IsrTimer0(void) interrupt 1 using 1 { //Timer0 Interrupt Service Routine
TR0 = 0;
TH0 = (65536 - mTimerValue) / 256;
TL0 = (65536 - mTimerValue) % 256;
TR0 = 1;
guc50ms++;
if(guc50ms == 20) { //20 * 50ms is 1s
guc50ms = 0;
if(gbIncOrder) {
gucIncTimeValue++;
if( gucIncTimeValue == 61 ) //Reset 60s
gucIncTimerValue = 0;
}
else {
gucDecTimeValue--;
if( gucDecTimeValue == 255 ) //Reset 60s
gucIncTimerValue = 60;
}
}
}
void Main(void) {
InitialSys();
while(1) {
if( !ioChooseIncStatus || !ioChooseDecStatus || !ioResetCountValue) {
DelayMs(15); //Clear The Key Disturb
if( !ioChooseIncStatus )
gbIncOder = 1;
else if( !ioChooseDecStatus )
gbIncOder = 0;
else if( !ioResetCountValue ) {
gucIncTimeValue = 0;
gucDecTImeValue = 60;
}
}
}
}
什么仿真?本回答被网友采纳