need help QSCI(urgent)

hi all

I'm having problem with my sci interrupt. it continue to execute
without stopping(looping) eventhough the program should execute once
on each charater received from the receiver.

do i have to disable/clear any flag in sci registers to avoid this to
heappen?

hope anyone can help me on this.maybe i had missed anything since iam
really new with this mpc555.

...below are the codes...maybe you can see the problem clearer

best regard.
nizam
//////////////////////////
//	Project Stationery  //
//////////////////////////

#include <stdio.h>
#include "mpc555.h"



   UINT32 counter = 0 ;		// Global for ISR to hold the 
   							// number of PIT interrupts
   UINT32 loopctr = 0 ;		// Loop counter for main loop



void SCI_Int (void);

void init555()				// Simple MPC555 Initialization
{
   USIU.SYPCR.R = 0xffffff03; // Disable watchdog timer 
   USIU.PLPRCR.B.MF = 0x009; // Run at 40MHz for 4MHz crystal
   while(USIU.PLPRCR.B.SPLS == 0);	// Wait for PLL to lock	
   UIMB.UMCR.B.HSPEED = 0;	// Run IMB at full clock speed				       
}



void initSci() 
{
							// STEP 1: MODULE SPECIFIC INITIALIZATION
							// Initialize the SCI for simple operation
    QSMCM.SCC1R0.B.SC1BR = 40000000/32/57600;	// Set baud rate
    QSMCM.SCC1R1.B.TE = 1;	// Transmitter enable
    QSMCM.SCC1R1.B.RE = 1;	// Receiver enable
							// Initialize buffer variables

							// STEP 2: LEVEL ASSIGMENT
    QSMCM.QDSCI_IL.B.ILDSCI = 5;	// define SCIIRQ at level 5

							// STEP 3: ENABLE INTERRUPT
    QSMCM.SCC1R1.B.RIE = 1;	// Enable receive interrupts only

							// STEP 4: SET APPROPRIATE SIMASK BITS
    USIU.SIMASK.R = 0x00100000; // Enable level 5; others disabled 
    
    
} 



main()
{
	init555();				
	initSci();			
 	asm(" mtspr EIE, r3");	// FINAL STEP: SET MSR[EE], MSR[RI] 

  	while(1)					
   	{
   	loopctr++;   			
   	}			     
}

void SCI_Int (void)			
{ 

	while(QSMCM.SC1SR.B.TDRE ==0); // check transmit data reg 
	QSMCM.SC1DR.R = 'X';          // not using Q:data to be 

 }  








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