MCU interrupt experiment 4-EEWORLD

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Circuit Diagram:

The program code is as follows:

//Traffic light control program

#include

unsigned char t0, t1; //Define global variables to save the number of delay time cycles

//delay0_5s1

//Function: Use T1's working mode 1 to compile a 0.5s delay program. Assume that the system uses a 12Mhz crystal oscillator, timer 1, working mode 1 timing 50ms, and then cycle 10 times to reach the timing of 0.5s

void delay0_5s1 () {

for (t0=0; t0<0x0a; t0++) {

TH1 = 0x3c;

TL1 = 0xb0;

TR1 = 1;

while (!TF1);

TF1=0;

}

//delay_t1

//Function: implement 0.5s * delay

//Parameter: unsigned char t;

// Delay time is 0.5s*t;

void delay_t1 (unsigned char t) {

for (t1=0; t1

delay0_5s1();

}

//int_0

//External interrupt 0 interrupt function, emergency handling, when the cpu responds to the interrupt request of external interrupt 0, this function is automatically executed to make the red lights in both directions light up for 10 seconds at the same time

void int_0 () interrupt 0 {

unsigned char i,j,k,l,m;

i = P1; //Protect the scene, temporarily store P1, t0, t1, TH1, TL0;

j = t0;

k = t1;

l = TH1;

m = TL1;

P2 = 0xdb; //The lights are red in both directions

delay_t1 (20); //delay 10s

P2 = i;

t0 = j;

t1 = k;

TH1 = 1;

TL1 = m;

}

//int_1

//Function: External interrupt 1 interrupt function, special case processing, when the cpu responds to the interrupt request of external interrupt 1, it automatically executes this function to achieve a to release 5s

void int_1 () interrupt 2 {

unsigned char i,j,k,l,m;

EA = 0;

i = P1;

j = t0;

k = t1;

l = TH1;

m = TL1;

EA = 1;

P2 = 0xf3;

delay_t1 (10);

EA = 0;

P2 = i;

t0 = j;

t1 = k;

TH1 = l;

TL1 = m;

EA = 1;

}

void main () {

unsigned char k;

TMOD = 0x10; //T1 is in working mode 1

EA = 1; // Enable general interrupt

EX0 = 1;

IT0 = 1;

EX1 = 1;

IT1 = 1;

while (1) {

P2 = 0xf3;

delay0_5s1();

P2 = 0xfb;

delay0_5s1();

}

P2 = 0xeb;

delay_t1(4);

P2 = 0xde;

delay_t1(110);

for (k=0; k<3; k++) {

P2 = 0xde;

delay0_5s1();

P2 = 0xdf;

delay0_5s1();

}

P2 = 0xdd;

delay_t1(4);

}

Keywords：MCU Reference address：MCU interrupt experiment 4

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