Level trigger and edge trigger program of microcontroller external interrupt

Connection method: JP10 to J12; JP8 to JP16; P3^2 to GND; P2^0 to LED;

EA: total enable bit
ES: serial port interrupt enable bit
ET1: timer counter 1 interrupt enable bit
EX1: external interrupt 1 interrupt enable bit
ET0: timer counter 0 interrupt enable bit
EX0: external interrupt 0 interrupt enable bit

The relationship between the 6 interrupt sources in the 52 single-chip microcomputer and the single-chip microcomputer ports:
1 The interrupt request line INT0 of external interrupt 0 is the P3.2 port line of P3 port
2 The interrupt request line INT1 of external interrupt 1 is the P3.3 port line of P3 port
3 The external counting input end of counter 0 is the P3.4 port line of P3 port of the single-chip microcomputer (timer 0 is an internal interrupt)
4 The external counting input end of counter 1 is the P3.5 port line of P3 port of the single-chip microcomputer (timer 1 is an internal interrupt)
5 Serial port interrupt (divided into serial port receive interrupt RXD, which is the P3.0 port line of P3 port of the single-chip microcomputer; serial port send interrupt TXD, which is the P3.1 port line of P3 port of the single-chip
microcomputer 6 The external counting input end of counter 2 is the P1.0 port line of P1 port of the single-chip microcomputer (timer 2 is an internal interrupt)

 TCON
TCON (Timer Control Register) Timer/Counter Control Register
TCON is in the special function register, the byte address is 88H, because of the bit address, it is very convenient to perform bit operations.
The function of TCON is to control the start and stop of the timer, and mark the timer overflow and interrupt.
The format of TCON is shown in the figure below. Among them, TF1, TR1, TF0 and TR0 are used for timer/counter; IE1, IT1, IE0 and IT0 are used for interrupt system.
The definition of each bit is as follows:
TF1: Timer 1 overflow flag. When timer 1 overflows, TF1 is set to "1" by hardware and an interrupt is requested. After entering the interrupt service routine, it is automatically cleared to "0" by hardware, and cleared to "0" by software in query mode.
TR1: Timer 1 operation control bit. Clear "0" by software to turn off timer 1. When GATE=1 and INT1 is high, TR1 is set to "1" to start timer 1; when GATE=0, TR1 is set to "1" to start timer 1.
TF0: Timer 0 overflow flag. Its function and operation are the same as TF1.
TR0: Timer 0 run control bit. Its function and operation are the same as TR1.
IE1: External interrupt 1 request flag.
IT1: External interrupt 1 trigger mode selection bit. When IT1=0, it is low level trigger mode; when IT1=1, it is falling edge trigger mode.
IE0: External interrupt 0 request flag.
IT0: External interrupt 0 trigger mode selection bit. When IT0=0, it is low level trigger mode; when IT0=1, it is falling edge trigger mode.
The lower 4 bits of TCON are related to interrupts. Since TCON is bit addressable, if you only want to clear overflow or start the timer, you can use bit operation commands. For example: after executing "CLR TF0", the overflow of timer 0 is cleared; after executing "SETB TR1", timer 1 can be started to work (of course, the mode must be set before). [page]
 code:

//Level trigger
#include
#include
#define uint unsigned int 
#define uchar unsigned char
sbit D1=P2^0;
uchar num;
uchar wnum=0x00;
uchar code dbit[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; //Segment selection, select the number to be displayed
//uchar code wnum[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdF,0xbF,0x7F}; //Eight-bit digital tube    
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
{
for(y=0;y<113;y++)
{
}
}
}
void main()
{
P1=wnum;
EA=1;//Turn on the main interrupt switch
EX0=1;//Turn on external interrupt 0, P3.2 select
IT0=0;//Select level trigger mode
while(1)
{
for(num=0;num<10;num++)
{
P0=dbit[num];
delay(500);
}
}
}
void duan() interrupt 0
{
D1=1;
delay(500);
D1=0;
delay(500); 
}

//Edge trigger mode
#include
#include
#define uint unsigned int 
#define uchar unsigned char
sbit D1=P2^0;
uchar num;
uchar wnum=0x00;
uchar code dbit[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};//Segment selection, select the number to be displayed
//uchar code wnum[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdF,0xbF,0x7F};//Eight-bit digital tube    
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
{
for(y=0;y<113;y++)
{
}
}
}
void main()
{
P1=wnum;
EA=1;//Turn on the main interrupt switch
EX0=1;//Turn on external interrupt 0, P3.2 select
IT0=1;//Select edge trigger mode
while(1)
{
for(num=0;num<10;num++)
{
P0=dbit[num];
delay(500);
}
}
}
void duan() interrupt 0
{
D1=1;
delay(500);
D1=0;
delay(500); 
}