第3个回答 2014-04-21
#include<reg51.h>
sbit key=P1^0;
main()
{
TMOD=0x20;
SCON=0x50;
TH1=0xfd;
TL1=0xfd;
TR1=1;
while(1)
{
while(key==1);
SBUF=0x55;
while(!TI);
TI=0;
while(key==0);
SBUF=0xaa;
while(!TI);
TI=0;
}
}
#include<reg51.h>
sbit led=P1^0;
main()
{
TMOD=0x20;
SCON=0x50;
TH1=0xfd;
TL1=0xfd;
TR1=1;
while(1)
{
if(RI)
{
RI=0;
if(SBUF==0x55)led=0;
else led=1;
}
}
}本回答被网友采纳