Exercise 4

#include "C8051F340.h"


void main(void){

	unsigned int a = 0;

	P2MDOUT  = 0x0C;        // pullup for LEDs
	P0SKIP   = 0xFF;        // skip P0
	P1SKIP   = 0xFF; 		// skip P1
	XBR1 	   = 0x70;		//
	OSCICN   = 0x83;		// Internal H-F clock: SYSCLK=12MHz
	PCA0MD   &= 0xBF; 	//watchdog configure
	PCA0MD   = 0x00;		//watchdog disable


			TMOD = 0x02;  //TIMER 0, 8bits with auto-reload

			TF0 = 0;     //clear flag

			TL0 = 256 - 250;

			TH0 = 256 - 250;

			TR0 = 1;

	while(1){

 	if(TF0){

 		TF0 = 0;
		a++;
 	if ( a == 2000){
 		TF0 = 0;

		P2_3 =! P2_3;
		a =0;


	}


	}
}
}