STC micro STC8A8K64D4 Series - Example Routines; Using Comparator (Interrupt Mode)

STC8A8K64D4 Series Manual
- 436 -
15.4 Example Routines
15.4.1 Using Comparator (Interrupt Mode)
C language code
// Operating frequency for test is 11.0592MHz
#include "reg51.h"
#include "intrins.h"
#define CMPEXCFG (*(unsigned char volatile xdata *)0xfeae)
sfr P_SW2 = 0xba;
sfr CMPCR1 = 0xe6;
sfr CMPCR2 = 0xe7;
sfr P1M1 = 0x91;
sfr P1M0 = 0x92;
sfr P0M1 = 0x93;
sfr P0M0 = 0x94;
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 CMP_Isr() interrupt 21
{
CMPCR1 &= ~0x40; // Clear interrupt flag
if (CMPCR1 & 0x01)
{
P10 = !P10; // Rising edge interrupt test port
}
else
{
P11 = !P11; // Falling edge interrupt test port
}
}
void main()
{
P0M0 = 0x00;
P0M1 = 0x00;
P1M0 = 0x00;
P1M1 = 0x00;
P2M0 = 0x00;
P2M1 = 0x00;
P3M0 = 0x00;