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ATtiny261-ESSZ Scheda tecnica(PDF) 149 Page - ATMEL Corporation |
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ATtiny261-ESSZ Scheda tecnica(HTML) 149 Page - ATMEL Corporation |
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149 / 227 page ![]() 149 7753C–AVR–07/09 ATtiny261/ATtiny461/ATtiny861 Figure 19-6. ADC Timing Diagram, Auto Triggered Conversion Figure 19-7. ADC Timing Diagram, Free Running Conversion 19.6 Changing Channel or Reference Selection The MUX5:0 and REFS2:0 bits in the ADMUX Register are single buffered through a temporary register to which the CPU has random access. This ensures that the channels and reference selection only takes place at a safe point during the conversion. The channel and reference selection is continuously updated until a conversion is started. Once the conversion starts, the channel and reference selection is locked to ensure a sufficient sampling time for the ADC. Con- tinuous updating resumes in the last ADC clock cycle before the conversion completes (ADIF in ADCSRA is set). Table 19-1. ADC Conversion Time Condition Sample & Hold (Cycles from Start of Conversion) Total Conversion Time (Cycles) First conversion 13.5 25 Normal conversions 1.5 13 Auto Triggered conversions 2 13.5 1 2 3 4 5 6 7 8 9 10 11 12 13 Sign and MSB of Result LSB of Result ADC Clock Trigger Source ADIF ADCH ADCL Cycle Number 12 One Conversion Next Conversion Conversion Complete Prescaler Reset ADATE Prescaler Reset Sample & Hold MUX and REFS Update 11 12 13 Sign and MSB of Result LSB of Result ADC Clock ADSC ADIF ADCH ADCL Cycle Number 12 One Conversion Next Conversion 34 Conversion Complete Sample & Hold MUX and REFS Update |
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