pllstartup.c

CodeWarrior for HCS12 V4.7

/******************************************************************************
													Copyright (c) Motorola 2001
File Name		 :	$RCSfile: PLLStartup.c,v $		
	
Engineer		 :	$Author: estyger $

Location		 :	EKB

Date Created	 :	26/09/2001

Current Revision :	$Revision: 1.1.1.1 $

Notes	:					

*******************************************************************************
Motorola reserves the right to make changes without further notice to any
product	herein to improve reliability, function	or design. Motorola does not
assume any liability arising out of the	application or use of any product,
circuit, or software described	herein;	neither	does it	convey any license
under its patent rights	nor the rights of others. Motorola products are	not
designed, intended, or authorized for use as components in systems intended for
surgical implant into the body, or other applications intended to support life,
or for any other application in which the failure of the  Motorola product
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Motorola and the Motorola logo*	are registered trademarks of Motorola Ltd.
******************************************************************************/

/************************* System Include Files ******************************/

/************************* Project Include Files *****************************/
#include "stdtypes.h"
#include "mcucfg.h"
#include "s12_crg.h"

/************************* typedefs ******************************************/

/************************* #Defines ******************************************/

/************************* Global Variables **********************************/
static volatile tCRG crg @(REG_BASE + 0x34);

/************************* External Variables ********************************/

/******************************************************************************
Function Name	:	PLLStartup
Engineer		   :	r27624
Date			   :	26/9/2001

Arguments		:	none
                  
Return			:	none

Notes				:	
******************************************************************************/
void
PLLStartup(void)
{
											/* fref = fosc / (REFDV+1) */
	crg.refdv.byte = REFDV;
											/* fvco = 2*fref*(SYNR+1) */
	crg.synr.byte = SYNR;
					 
	crg.pllctl.byte = CME   | 				/* clock monitor enabled */
					  PLLON | 				/* PLL on */
					  AUTO	|				/* automatic bandwidth control enabled */
					  SCME;					/* self clock mode enabled */

											/* wait for lock */
	while(crg.crgflg.bit.lock != 1);
											/* switch to PLLCLK */
	crg.clksel.byte |= PLLSEL;

	return;
}