SCM C language program design: use counter interrupt to achieve button count within 100
/* Name: Use the counter interrupt to achieve the button count within 100
Description: In this example, the T0 counter interrupt is used to implement the button technology. Since the initial value of the count register is 1,
Each negative transition of the P3.4 pin triggers a T0 interrupt, which increments the count value.
The clearing of the counter is controlled by external interrupt 0.
*/
#include
#define uchar unsigned char
#define uint unsigned int
//segment code
Uchar code
DSY_CODE[]={0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f, 0x00};
Uchar Count=0;
/ / Main program
Void main()
{
P0=0x00;
P2=0x00;
TMOD=0x06; //Counter T0 mode 2
TH0=TL0=256-1; //Count value is 1
ET0=1; //Allow T0 interrupt
EX0=1; //Allow INT0 interrupt
EA=1; //Allow CPU interrupt
IP=0x02; //Set priority, T0 is higher than INT0
IT0=1; //INT0 interrupt trigger mode is falling edge trigger
TR0=1; //Start T0
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