//External connection: P1.0 is connected to T1 counter input terminal P3.5.
Keywords：C51
Reference address：C51 Timer/Counter
#include
sbit out=P1^0;
void main()
{
//T0 timer, working mode 2. Its interrupt function makes the out pin output pulse
//T1 counter, working mode 1. Its interrupt function makes P2 output pulse
TMOD=0x52;
//Interrupt enable
ET0=1;
ET1=1;
EA=1;
//Set T0 time constant, timing 200us,
TH0=56;
TL0=56;
//Set T1 time constant, count 2500
TH1=(65536-2500)/256;
TL1=(65536-2500)%256;
//Start
TR0=1;
TR1=1;
while(1)
;
}
//Call this function every 200us,
void t0fun() interrupt 1
{
out=~out;
}
// When T1 reaches 2500, call this function
void t1fun() interrupt 3
{
P2=~P2;
//Set T1 time constant, count 2500
TH1=(65536-2500)/256;
TL1=(65536-2500)%256;
}
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