#include?
#define?uchar?unsigned?char
#define?uint?unsigned?int

sbit?LED=P1^0;
uchar?code?seg_table[]={0x3f0x060x5b0x4f0x66?
					????0x6d0x7d0x070x7f0x6f};

uchar?count=0;
uchar?second=0;
uchar?receive=0;


void?delay（uint?i）
{
??while（i--）;
}

void?timer0（void）?interrupt?1
{
???TH0=（65536-50000）/256;
???TL0=（65536-50000）%256;
???count++;
???if（count?==?20）??
???{
?????count=0;
	?second++;
	?if（second?==?60）
	???second=0;
???}
}

void?int0（void）?interrupt?0
{
??second++;
??if（second==60）
????second=0;
}

void?int1（void）	interrupt?2
{
??second--;
??if（second>60）
????second=59;
}

void?serial（void）?interrupt?4
{??
??if（TI==1）
??{
????TI=0;
????SBUF=second;
??}
??else
??{
????RI=0;
	receive=SBUF;
	if（receive?==?0x55）
	{
??????LED?=?~LED;
	}
??}
}


void?main（void）
{
???uchar?dec;
???uchar?sig;

???TMOD=0x21;??//T0?mode?1?16bit?timer;T1?mode?2?8bit?automatic
???PCON=0x00;?//SMOD=0
???TH0=（65536-50000）/256;??//time?50ms
???TL0=（65536-50000）%256;??
???
???TH1=0xfd;
???TL1=0xfd;?//baudrate?9600?oscilator?12MHz

???ET0=1;?//open?T0?interrupt
???ET1=0;??//must?close?T2‘s?interrupt
???EX0=1;?//open?int0?
???EX1=1;?//open?int1
???ES=1;?//open?serial?interrupt
???EA=1;?//open?the?general?interrupt
???IT0=1;?//int0?triggered?by?faling?edge
???IT1=1;?//int1?triggered?by?faling?edge
???TR0=1;?//start?T0
???TR1=1;?//start?T1

???SM2=0;?//two?at89c51?communicate?by?uart?not?more?than?three?CPUs
???SM0=0;
???SM1=1;?//serial?prot?mode?1?10bit/frame
???REN=1;
???

???SBUF=second;?//send?one?frame?through?uart?to?trigger?the?uart?interrupt
???while（1）
???{
?????dec=second/10;
?????sig=second%10;
?????P2=seg_table[dec];
?????P0=seg_table[sig];
	?delay（50）;
???}

}

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件?????104366??2014-12-09?18:44??uartcom\Last?Loaded?uartcom.DBK

?????文件?????104366??2014-12-09?18:44??uartcom\uartcom.DSN

?????文件???????1078??2014-12-10?16:20??uartcom\uartcom.PWI

?????文件???????1800??2014-12-10?16:19??uartcom\uartcpu1\uartcpu1.c

?????文件???????4083??2014-12-10?15:31??uartcom\uartcpu1\uartcpu1.LST

?????文件???????7721??2014-12-10?15:31??uartcom\uartcpu1\uartcpu1.m51

?????文件???????9259??2014-12-09?15:53??uartcom\uartcpu1\uartcpu1.plg

?????文件??????55216??2014-12-10?15:31??uartcom\uartcpu1\uartcpu1.uvopt

?????文件??????13248??2014-12-09?15:55??uartcom\uartcpu1\uartcpu1.uvproj

?????文件???????5278??2014-12-10?15:31??uartcom\uartcpu1\uartcpu1out\uartcpu1

?????文件???????1194??2014-12-10?15:31??uartcom\uartcpu1\uartcpu1out\uartcpu1.hex

?????文件?????????84??2014-12-10?15:31??uartcom\uartcpu1\uartcpu1out\uartcpu1.lnp

?????文件???????5826??2014-12-10?15:31??uartcom\uartcpu1\uartcpu1out\uartcpu1.obj

?????文件????????376??2014-12-10?15:31??uartcom\uartcpu1\uartcpu1out\uartcpu1.plg

?????文件??????55222??2014-12-10?15:18??uartcom\uartcpu1\uartcpu1_uvopt.bak

?????文件??????????0??2014-12-09?14:36??uartcom\uartcpu1\uartcpu1_uvproj.bak

?????文件????????742??2014-12-10?15:30??uartcom\uartcpu2\uartcpu2.c

?????文件???????2460??2014-12-10?15:30??uartcom\uartcpu2\uartcpu2.LST

?????文件???????4909??2014-12-10?15:30??uartcom\uartcpu2\uartcpu2.m51

?????文件???????2858??2014-12-09?16:16??uartcom\uartcpu2\uartcpu2.plg

?????文件??????55216??2014-12-10?15:30??uartcom\uartcpu2\uartcpu2.uvopt

?????文件??????13247??2014-12-09?16:16??uartcom\uartcpu2\uartcpu2.uvproj

?????文件???????3420??2014-12-10?15:30??uartcom\uartcpu2\uartcpu2out\uartcpu2

?????文件????????767??2014-12-10?15:30??uartcom\uartcpu2\uartcpu2out\uartcpu2.hex

?????文件?????????84??2014-12-10?15:30??uartcom\uartcpu2\uartcpu2out\uartcpu2.lnp

?????文件???????3536??2014-12-10?15:30??uartcom\uartcpu2\uartcpu2out\uartcpu2.obj

?????文件????????376??2014-12-10?15:30??uartcom\uartcpu2\uartcpu2out\uartcpu2.plg

?????文件??????55222??2014-12-10?15:21??uartcom\uartcpu2\uartcpu2_uvopt.bak

?????文件??????????0??2014-12-09?15:56??uartcom\uartcpu2\uartcpu2_uvproj.bak

?????目錄??????????0??2014-12-31?21:54??uartcom\uartcpu1\uartcpu1out

............此處省略7個(gè)文件信息