main.c

pic单片机例程

#include <htc.h>	// Required to interface with delay routines

#ifndef _XTAL_FREQ
 // Unless already defined assume 4MHz system frequency
 // This definition is required to calibrate __delay_us() and __delay_ms()
 #define _XTAL_FREQ 4000000
#endif

/** demonstration of various built-in delay mechanisms */
void main(void){
	while(1){
		NOP();
		_delay(1000);		// delay for 1000 instruction cycles
		CLRWDT();
		__delay_us(400);	// delay for 400 microseconds
		CLRWDT();
		__delay_ms(2);		// delay for 2 milliseconds
		CLRWDT();
	}
}