STC micro STC8A8K64D4 Series - Example Routines; INT0 Interrupt (Rising and Falling Edges)

STC8A8K64D4 Series Manual
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11.5 Example Routines
11.5.1 INT0 Interrupt (Rising and Falling Edges)
C language code
//Operating frequency for test is 11.0592MHz
#include "reg51.h"
#include "intrins.h"
sfr P0M1 = 0x93;
sfr P0M0 = 0x94;
sfr P1M1 = 0x91;
sfr P1M0 = 0x92;
sfr P2M1 = 0x95;
sfr P2M0 = 0x96;
sfr P3M1 = 0xb1;
sfr P3M0 = 0xb2;
sfr P4M1 = 0xb3;
sfr P4M0 = 0xb4;
sfr P5M1 = 0xc9;
sfr P5M0 = 0xca;
sbit P10 = P1^0;
sbit P11 = P1^1;
void INT0_Isr() interrupt 0
{
if (INT0) //Judging rising and falling edges
{
P10 = !P10; //Test port
}
else
{
P11 = !P11; //Test port
}
}
void main()
{
P0M0 = 0x00;
P0M1 = 0x00;
P1M0 = 0x00;
P1M1 = 0x00;
P2M0 = 0x00;
P2M1 = 0x00;
P3M0 = 0x00;
P3M1 = 0x00;
P4M0 = 0x00;
P4M1 = 0x00;
P5M0 = 0x00;
P5M1 = 0x00;
IT0 = 0; //Enable INT0 rising edge and falling edge interrupts
EX0 = 1; //Enable INT0 interrupt
EA = 1;
while (1);
}