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16F1825 데이터시트(PDF) 153 Page - Microchip Technology |
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16F1825 데이터시트(HTML) 153 Page - Microchip Technology |
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153 / 420 page ![]() 2010 Microchip Technology Inc. Preliminary DS41440A-page 153 PIC16F/LF1825/1829 16.1.4 CONVERSION CLOCK The source of the conversion clock is software select- able via the ADCS bits of the ADCON1 register. There are seven possible clock options: •FOSC/2 •FOSC/4 •FOSC/8 •FOSC/16 •FOSC/32 •FOSC/64 •FRC (dedicated internal oscillator) The time to complete one bit conversion is defined as TAD. One full 10-bit conversion requires 11.5 TAD peri- ods as shown in Figure 16-2. For correct conversion, the appropriate TAD specifica- tion must be met. Refer to the A/D conversion require- ments in Section 30.0 “Electrical Specifications” for more information. Table 16-1 gives examples of appro- priate ADC clock selections. Note: Unless using the FRC, any changes in the system clock frequency will change the ADC clock frequency, which may adversely affect the ADC result. |
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