99秒倒计时器数字电路仿真图 用Multisim做99倒计时电路，有人有电路图吗？很急！在...
99\u79d2\u5012\u8ba1\u65f6\u7535\u8def\u56fe\u53ef\u952e\u76d8\u8bbe\u7f6e\u5012\u8ba1\u65f6\u65f6\u95f4
#include
#define uchar unsigned char
#define uint unsigned int
sbit p20=P2^0;
sbit p21=P2^1;
sbit p30=P3^0;
sbit p31=P3^1;
sbit p32=P3^2;
#define key_0 0x18
#define key_1 0x14
#define key_2 0x12
#define key_3 0x11
#define key_4 0x28
#define key_5 0x24
#define key_6 0x22
#define key_7 0x21
#define key_8 0x48
#define key_9 0x44
#define key_reset 0x42
#define key_stop 0x88
#define key_start 0x84
#define key_shi 0x82
#define key_ge 0x81
uchar t;
uchar ct=10;
uchar dh=1,dl=0;
uchar tab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; //\u5171\u9633\u6781\u65f6\u76840\uff5e9
uchar key_table[]={0x18,0x14,0x12,0x11,0x28,0x24,0x22,0x21,0x48,0x44};
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void init(void)
{
TMOD=0x01; //\u9009\u62e9\u65b9\u5f0f1
TH0=0x3c; //12M\u6676\u632f\uff0c\u5b9a\u65f6\u65f6\u95f450ms
TL0=0xb0;
EA=1; //\u5f00\u542f\u603b\u4e2d\u65ad
ET0=1; //\u5f00\u542f\u5b9a\u65f6\u56680\u6ea2\u51fa\u4e2d\u65ad
TR0=1; //\u542f\u52a8\u5b9a\u65f6\u56680
}
void display(void)
{
P0=tab[dh];
p20 = 1;
delay(2);
p20=0;
P0=tab[dl];
p21=1;
delay(2);
p21=0;
}
void display0(void)
{
P0=tab[dh];
p20 = 1;
delay(2);
p20=0;
P0=tab[dl];
p21=1;
delay(100);
p21=0;
}
void display1(void)
{
P0=tab[dh];
p20 = 1;
delay(100);
p20=0;
P0=tab[dl];
p21=1;
delay(2);
p21=0;
}
void timer0(void) interrupt 1 //\u5b9a\u65f6\u5668\u4e2d\u65ad
{
uchar t;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
t++;
dh=ct/10;
dl=ct%10;
display();
if(t==20) //\u6bcf\u79d2\u8fdb\u4e00\u6b21\u4e2d\u65ad
{
t=0;
ct--;
if(ct==-1)
{
TR0=0;
p32=1;p31=1;p30=0;
}
}
}
void dlms(void)
{uchar i;
for(i=200;i>0;i--)
{}
}
uchar kbscan(void)
{uchar scode,recode;
P1=0xf0;
if((P1&0xf0)!=0xf0)
{dlms();
if((P1&0xf0)!=0xf0)
{scode=0xfe;
while((scode&0x10)!=0)
{P1=scode;
if((P1&0xf0)!=0xf0)
{recode=(P1&0xf0)|0x0f;
return((~scode)+(~recode));
}
else
scode=(scode<<1)|0x01;
}
}
}
return(0);
}
void key_process(uchar key,uchar *dh,uchar *dl,uchar *ct)
{
static uchar k;
if(key==key_reset)
{*dh=0;
*dl=0;
*ct=(*dh)*10+(*dl);
p32=1;p31=1;p30=0;
}
if(key==key_0||key==key_1||key==key_2||key==key_3||key==key_4||key==key_5||key==key_6||key==key_7||key==key_8||key==key_9)
{k=0;
while(1)
{if(key==key_table[k])
break;
k++;
}
}
if(key==key_stop)
{TR0=0;
p32=1;p31=0;p30=1;
}
if(key==key_start)
{TR0=1;
p32=0;p31=1;p30=1;
}
if(key==key_shi)
{*dh=k;
display0();
*ct=(*dh)*10+(*dl);
}
if(key==key_ge)
{*dl=k;
display1();
*ct=(*dh)*10+(*dl);
}
}
void main()
{
uchar key;
p32=0;p31=1;p30=1;
init();
while(1)
{
key=kbscan();
dlms();
if(key!=0)
{
// switch(key)
// {case 0x18: n=0; break;
// case 0x14: n=1; break;
// case 0x12: n=2; break;
// case 0x11: n=3; break;
// case 0x28: n=4; break;
// case 0x24: n=5; break;
// case 0x22: n=6; break;
// case 0x21: n=7; break;
// case 0x48: n=8; break;
// case 0x44: n=9; break;
// case 0x42: n=10; break;
// case 0x41: n=11; break;
// case 0x88: TR0=0; break;
// case 0x84: TR0=1; break;
// case 0x82: n=14; break;
// case 0x81: n=15; break;
// }
key_process(key,&dh,&dl,&ct);
//if(p26==0)
//{dh=n;display0();ct=dh*10+dl;}
//if(p27==0)
//{dl=n;display1();ct=dh*10+dl;}
}
//if(p26==0) display0();
//if(p27==0) display1();
//else display();
display();
}
}
\u6e90\u7a0b\u5e8f\u4f9b\u4f60\u53c2\u8003\u53ef\u4ee5\u6539\u52a8
\u6211\u8fd9\u662f24\u5c0f\u65f6\u65f6\u949f\u52a0\u6cd5\u5668 multisim12\u505a\u7684\uff0c\u5176\u5b9e\u4f60\u8981\u7684\u5012\u8ba1\u65f6\u5c31\u662f\u8fd9\u4e2a\u7684\u9006\u8fc7\u7a0b\u3002\u81f3\u4e8e99\u4f60\u53ef\u4ee5\u7528\u4eec\u7535\u8def\u9650\u5236\u4f7f\u5b83\u8fbe\u5230\u4f60\u60f3\u8981\u7684\u4efb\u4f55\u6570\u5b57
\u539f\u7406\u7b80\u5355\u8ddf\u4f60\u8bf4\u4e0b\u5427\uff0c\u7528555\u5b9a\u65f6\u5668\u4ea7\u751f1000HZ\u65b9\u6ce2\uff0c\u75283\u4e2a74ls192d\u5206\u9891\u4e3a1HZ\uff0c\u201c\u4e3a\u4ec0\u4e48\u8981\u5206\u9891\uff0c\u76f4\u63a51Hz\u4e0d\u884c\u4e48\uff1f\u4e0d\u884c\uff0c\u7cbe\u786e\u5ea6\u5927\u5927\u6709\u95ee\u9898\u201d\uff0c\u4f60\u8981\u768499\u5f88\u7b80\u5355\uff0c\u75282\u4e2a74ls160D \u4ed6\u76843 \uff0c4 \uff0c5,6\u811a\u662f\u521d\u59cb\u5316\u663e\u793a\u9009\u5b9a\uff0c\u4e5f\u5c31\u662f8421\u7801\u4f60\u9009\u4e2d1001\u8fd9\u6837\u5c31\u663e\u793a9\u4e86\uff0c2\u4e2a\u90fd\u663e\u793a\u4f4d99\uff0c\u5176\u4ed6\u4f7f\u80fd\u4f60\u770b\u4e0b\uff0c\u7b2c\u4e00\u4e2aCLK\u63a51HZ\uff0c\u7b2c\u4e8c\u4e2a74LS160D\u63a5\u7b2c\u4e00\u4e2a\u7684\u8fdb\u4f4d\u5927\u81f4\u5c31\u8fd9\u6837\uff0c\u4f60\u53ef\u4ee5\u53bb\u67e5\u4e0b\u82af\u7247\u8d44\u6599\u4e00\u770b\u5c31\u660e
在上图基础上稍作修改，如两192置数输入D0~D3设为1001(=9)，加入555 1秒时基...等就可以。
给你个参考
555脉冲发生器电路，就请你自己去完成好了
我要搞鸡了啊啊啊啊啊啊啊啊啊啊a
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