51 MCU interrupt system experiment-EEWORLD

Collect

1. Experimental Content

INT0 is connected to a single pulse generator. Pressing a pulse generates an interrupt, and the CPU reverses the state of P1.0. P1.0 is connected to an LED light to check the signal reversal.

Write a program based on the experimental content, and debug and verify it on the experimental system.

2. Simulation diagram

3. Code

C language implementation:

sbit LED=P1^0;

void INT0_IN();

void main()

{

LED=0;

INT0_IN();

while(1) ;

}

void INT0_IN()

{

EA=1; //General interrupt is turned on

EX0=1; //External interrupt 0 is turned on

IT0=0; //Negative edge trigger

}

void exter0() interrupt 0

{

IE0=0;

LED=~LED;

}

Assembly implementation:

LED BIT P1.0

LEDBUF BIT 20H

ORG 0000H

LJMP START

ORG 0003H

LJMP INT00

ORG 0030H

START: MOV SP,#60H

CLR LEDBUF // clear to 0

CLR LED // clear to 0

MOV TCON, #01H ; External interrupt 0 falling edge trigger

MOV IE, #81H ; Enable external interrupt enable bit (EX0) and general interrupt enable bit (EA)

OK: LJMP OK

INT00: PUSH PSW; protect the scene

CPL LEDBUF ; Invert LED

MOV C, LEDBUF

MOV LED, C

POP PSW ; Recovery site

RARELY

END

Reference address：51 MCU interrupt system experiment

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