80C31 MCU external interrupt 0-EEWORLD

External interrupt 0 interrupt, the effect is that the lower four bits are lit, and the upper four bits are lit when the interrupt occurs.

After the interruption, the program returns to the main program and continues to light up the lower four bits.

#include

//To interrupt, you need to set some parameters

void center1()

{

EX0 = 1; //Interrupt enable switch

IT0 = 0; // Falling edge trigger mode

EA = 1; // Main switch

}

void main(void) //Main function

{

zhongduan1();

//Low level lights up

while(1) //Large loop

{

P0 = 0xf0; //light up the lower four bits 1111 0000

}

//Now create an interrupt, when the interrupt occurs, the high four bits are lit

void zhongduan() interrupt 0

{

P0 = ~0xf0; //The content to be executed after the interrupt occurs is the high four bits are lit

}

Keywords：80C31 Reference address：80C31 MCU external interrupt 0

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