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What is the best way to change a timer frequency without stopping the timer

		
	
				

			

									
					    tec
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Oct 14, 2009 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
		    			
    
			    
    I start out using a timer set to interrupt at 70 Hz. Then I want to adjust the timer interrupt to another value around 70 like 69.5Hz. My timer will need to adjust as a function of a commutator speed. I cannot stop the timer. Can I adjust TM0PRD while it is running?
    
 
    Thanks,
    
			
    
			
									
		                             
                        

    
    
                                            
                 2136x
                
                                                    
                 sharc
                
                                                    
                 ezkit
                
                                                    
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Oct 14, 2009 7:43 PM
            
            
						
			            		
      
		
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      Hi ,
      
 
      Yes ,  you could change the timer settings on the fly. All you need to do is wait for few cycles for the timer to get enabled with the original timer settings and then change the timer period and width for the following cycle. The new settings take effect after the inital timer setting cycle completes. Attached is  an example that shows this. In the example I change from 70 Hz to 50 Hz.
      
 
      Hope this is useful
      
 
      Thanks,
      
 
      Divya
      
			
      

		
			
	      

		
				TimerExample.zip
			
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Oct 14, 2009 7:43 PM
            
            
						
			            		
      
		
										0
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      Hi ,
      
 
      Yes ,  you could change the timer settings on the fly. All you need to do is wait for few cycles for the timer to get enabled with the original timer settings and then change the timer period and width for the following cycle. The new settings take effect after the inital timer setting cycle completes. Attached is  an example that shows this. In the example I change from 70 Hz to 50 Hz.
      
 
      Hope this is useful
      
 
      Thanks,
      
 
      Divya
      
			
      

		
			
	      

		
				TimerExample.zip
			
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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