STC micro STC8A8K64D4 Series - Example Routines; P0 Falling Edge Interrupt

STC8A8K64D4 Series Manual
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12.2 Example Routines
12.2.1 P0 Falling edge interrupt
C language code
// Operating frequency for test is 11.0592MHz
#include "reg51.h"
#include "intrins.h"
sfr P0M0 = 0x94;
sfr P0M1 = 0x93;
sfr P1M0 = 0x92;
sfr P1M1 = 0x91;
sfr P2M0 = 0x96;
sfr P2M1 = 0x95;
sfr P3M0 = 0xb2;
sfr P3M1 = 0xb1;
sfr P4M0 = 0xb4;
sfr P4M1 = 0xb3;
sfr P5M0 = 0xca;
sfr P5M1 = 0xc9;
sfr P6M0 = 0xcc;
sfr P6M1 = 0xcb;
sfr P7M0 = 0xe2;
sfr P7M1 = 0xe1;
sfr P_SW2 = 0xba;
#define P0INTE (*(unsigned char volatile xdata *)0xfd00)
#define P0INTF (*(unsigned char volatile xdata *)0xfd10)
#define P0IM0 (*(unsigned char volatile xdata *)0xfd20)
#define P0IM1 (*(unsigned char volatile xdata *)0xfd30)
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;
P_SW2 |= 0x80;
P0IM0 = 0x00; // Falling edge interrupt
P0IM1 = 0x00;
P0INTE = 0xff; // Enable P0 port interrupt
P_SW2 &= ~0x80;
EA = 1;