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ATtiny44 Datasheet(PDF) 147 Page - ATMEL Corporation |
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ATtiny44 Datasheet(HTML) 147 Page - ATMEL Corporation |
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147 / 236 page  147 8006H–AVR–10/09 ATtiny24/44/84 For offset calibration purpose the offset of the certain differential channels can be measure by selecting the same input for both negative and positive input. This calibration can be done for ADC0, ADC3 and ADC7. “Operation” on page 133 describes offset calibration in a more detailed level. 16.13.2 ADCSRA – ADC Control and Status Register A • Bit 7 – ADEN: ADC Enable Writing this bit to one enables the ADC. By writing it to zero, the ADC is turned off. Turning the ADC off while a conversion is in progress, will terminate this conversion. • Bit 6 – ADSC: ADC Start Conversion In Single Conversion mode, write this bit to one to start each conversion. In Free Running mode, write this bit to one to start the first conversion. The first conversion after ADSC has been written ADC3 (PA3) ADC0 (PA0) 101010 101011 ADC1 (PA1) 101110 101111 ADC2 (PA2) 110000 110001 ADC3 (PA3)(1) 100100 100101 ADC4 (PA4 010010 010011 ADC5 (PA5) 010100 010101 ADC6 (PA6) 010110 010111 ADC7 (PA7) 011000 011001 ADC4 (PA4) ADC3 (PA3) 110010 110011 ADC5 (PA5) 011010 011011 ADC5 (PA5) ADC3 (PA3) 110100 110101 ADC4 (PA4) 111010 111011 ADC6 (PA6) 011100 011101 ADC6 (PA6) ADC3 (PA3) 110110 110111 ADC5 (PA5) 111100 111101 ADC7 (PA7) 011110 011111 ADC7 (PA7) ADC3 (PA3) 111000 111001 ADC6 (PA6) 111110 111111 ADC7 (PA7)(1) 100110 100111 1. For offset calibration, only. See “Operation” on page 133. Table 16-5. Differential Input channel Selections. (Continued) Positive Differential Input Negative Differential Input MUX5:0 Gain 1x Gain 20x Bit 7654 321 0 0x06 (0x26) ADEN ADSC ADATE ADIF ADIE ADPS2 ADPS1 ADPS0 ADCSRA Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0000 000 0 |
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