ex3-7.c

这是《Keil Cx51 V7.0单片机高级语言编程与uVision2应用实践》教材各章中列出的全部程序例子。

 #pragma  cd
 #include <reg51.h>
 extern void alfunc(bit b0);
 extern bit alarm;
 int DTIMES;
 char bdata flag;
 sbit flag0=flag^0;
 int dtime1=0x0a;

void int0 () interrupt 0 using 1 {
   TR1=0;
   flag0=!flag0;
   DTIMES=dtime1;
   dtime1=0;
   TR1=1;
 }

void timer1 () interrupt 3 using 3 {
   alfunc(alarm=1);
   TH1=0x3c;
   TL1=0xB0;
   dtime1=dtime1+1;
   if (dtime1==0)
     {
      P0=0;
     }
  }