51 MCU counter T1 counts external pulses

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Method 1: Delay method

Hardware: 11.0592MHz crystal, STC89C52, RXD P1.0 TXD P1.1 T1 P3.5

Baud rate: 9600

Description: T0 is used for timing, mode 1, timing time 50ms, interrupt mode; T1 is used for counting. After the 10s timing time is up, the counted pulse is sent out through the analog serial port. The external pulse is a square wave with a frequency of 1Hz generated by STM8L101. 1 falling edge every 1s

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#include "reg52.h"

#define uchar unsigned char

sbit P1_0 = 0x90;

sbit P1_1 = 0x91;

sbit P1_2 = 0x92;

#define RXD P1_0

#define TXD P1_1

#define WRDYN 44 //Write delay

#define RDDYN 43 //Read delay

void Delay2cp(unsigned char i);

unsigned char num=0;

//Write a byte to the serial port

void WByte(uchar input)

{

fly i=8;

TXD=(bit)0; //Send start bit

Delay2cp(39);

//Send 8 bits of data

while(i--)

{

TXD=(bit)(input&0x01); //Transmit low bit first

Delay2cp(36);

input=input>>1;

}

//Send check digit (none)

TXD=(bit)1; //Send end bit

Delay2cp(46);

}

//Read a byte from the serial port

fly RByte(void)

{

uchar Output=0;

fly i=8;

flying temp=RDDYN;

//Send 8 bits of data

Delay2cp(RDDYN*1.5); //Note here, wait until the start bit

while(i--)

{

Output >>=1;

if(RXD) Output |=0x80; //Receive low bit first

Delay2cp(35); //(96-26)/2, the loop takes up 26 instruction cycles in total

}

while(--temp) //Search for the end position within the specified time.

{

Delay2cp(1);

if(RXD)break; //exit after receiving the end bit

}

return Output;

}

//Delay program*

void Delay2cp(unsigned char i)

{

     while(--i); //Exactly two instruction cycles.

}

void TimerInit()

{

TMOD=0x41; //T1, counting mode, T0, timing mode, mode 1

TH0=0x4C; //T0,50ms timing initial value

TL0=0x00; //T0,50ms timing initial value

TH1=0x00; //Count initial value cleared to 0

TL1=0x00; //Count initial value cleared to 0

TR0=1; //Start timer T0

TR1=1; //Open counter T1

ET0=1; //Open timer T0 interrupt

EA=1; //Open the general interrupt

}

void main()

{

flying ccc;

TimerInit();

while(1){}

}

void timer0(void) interrupt 1

{

TH0=0x4C; //Reset the timing initial value

TL0=0x00; //Reset the timing initial value

num++;

if(num==200) // count the pulses within 10 seconds

{

WByte(TH1);

WByte(TL1);

num=0; //clear to 0

TH1=0;

TL1=0;

}

TF0=0; //Software clears interrupt flag

}

Count 10 pulses in 10 seconds and 1 falling edge in 1 second.