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ADUC814 Production
The ADuC814 MicroConverter® is a fully integrated 12-bit data acquisition system-on-a-chip. Like all of ADI's MicroConverter products, it features precision...
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ADUC814 on Analog.com

ADUC841 Production
The ADuC841/ADuC842/ADuC843 are complete smart transducer front ends, that integrates a high performance self-calibrating multichannel ADC, a dual DAC...
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ADUC841 on Analog.com

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ADuC8xx interrupt latencies ?

		
	
				

			

									
					    Onti
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Oct 9, 2021 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user inquired about the interrupt latencies for the ADuC814 and ADuC841 microcontrollers. The final answer specifies that the ADuC814 at 16.78 MHz has a latency of 2.15 μs (3 machine cycles), and the ADuC841 at 20 MHz has a latency of 0.15 μs (3 machine cycles). The user noted that this information should be included in the 'INTERRUPT SYSTEM' datasheet chapter.
                        	    

                
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I briefly checked the datasheet(s) but haven't really found concrete numbers on the ADuC8xx interrupt latencies.  Specifically ADuC814 @ 16.78 MHz and ADuC841 @ 20 MHz.  How much time (or cycles) need those from the interrupt signal to the first ISR opcode ?

			

			
									
		                             
                        

    

                                            
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                 microcontrollers
                
                                                    
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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Oct 10, 2021 3:18 AM
            
            
						
			            		
    
		
								
	
    

		
		
    
		
    
                                
                                                            
    
					
    Hi,
    

    I'll get back to you on the interrupt latencies as soon as possible.
    

    Regards,
    Karl
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Oct 11, 2021 5:01 AM
            
            
												
						in reply to Karl.O
					
										
			            		
    
		
								
	
    

		
		
    
		
    
                                
                                                            
    
					
    For the ADuC814, the machine cycle consists of 12 core clock periods of the selected core operating frequency. While ADuC841 consists of 1 core clock period.
    

    ADuC814 @ 16.78MHz - single cycle is around 715ns.
    ADuC841 @ 20MHz - single cycle is around 50ns.
    

    The interrupts flags are detected in the next machine cycle, and the ISR call takes two cycles. A minimum of three machine cycles elapses from the activation of the interrupt to the beginning of the ISR.
    

    ADuC814, 3 machine cycle - 2.15us.
    ADuC841, 3 machine cycle - 0.15us.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
				
						
				
				
		
		
    
			
		
    
	
    

    

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                on Oct 11, 2021 8:59 AM
            
            
												
						in reply to Karl.O
					
										
			            		
    
		
								
	
    

		
		
    
		
    
                                
                                                            
    
					
    Thanks, that helps and definately should be mentioned the in the "INTERRUPT SYSTEM" datasheet chapter.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
				
						
				
				
		
		
    
			
		
    
	
    

    

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