//Example 17-14 for TWR-HCS12G128 Tower module using CodeWarrior 
//Modified by Mazidi from Example 17-14 of Mazidi & Causey HCS12 textbook
//Tested by Brandon Collison
//Using Scope, observe the PWM signal generated on PP2 pin
//PP2 is available on pin 18 (PP2) of J3 of Axiom Peripheral board
//See page 9 of TWR Axiom Peripheral board User Guide
//http://www.axman.com/sites/default/files/TWR-DEV-PERIPH_UG.pdf
 

//Use F7 to Make, F5 (Debug) to download, and F5 (Start) to run the program

//In CodeWarrior,make sure you are in Open Source BDM when downloading and running. 

#include <hidef.h>      /* common defines and macros */
#include "derivative.h"      /* derivative-specific definitions */


void main(void) 
{
  /* put your own code here */
  
 PWMPRCLK=0x30; 	//ClockSB=Fbus/8=6.25MHz/8 = 781250Hz
 PWMSCLB=50; 		//ClockSB/2x50=781225Hz/100=7812Hz	
 PWMCLK=0x04; 		//Use ClockSB for chan 2	
 PWMPOL=0x04;		//high, then low for polarity 	
 PWMCAE=0;		//left aligned 		
 PWMCTL=0;		//8-bit chan,PWM during freeze and wait
 PWMPER2=100;		//PWMFreq=ClockSB/100=7812Hz/100=78Hz 		
 PWMDTY2=40;		//40% duty cycle. Change this and view the scope		 	
 PWMCNT2=0;		//clear PWMCNT2
 PWME=0x04;		//turn on (start) PWM2
 while(1);		//stay here.
	   
 
}