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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC16LC71 датащи(PDF) 45 Page - Microchip Technology |
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PIC16LC71 датащи(HTML) 45 Page - Microchip Technology |
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45 / 176 page  © 1997 Microchip Technology Inc. DS30272A-page 45 PIC16C71X 7.9 Transfer Function The ideal transfer function of the A/D converter is as fol- lows: the first transition occurs when the analog input voltage (VAIN) is Analog VREF/256 (Figure 7-6). 7.10 References A very good reference for understanding A/D convert- ers is the "Analog-Digital Conversion Handbook" third edition, published by Prentice Hall (ISBN 0-13-03- 2848-0). FIGURE 7-6: A/D TRANSFER FUNCTION FFh FEh 04h 03h 02h 01h 00h Analog input voltage FIGURE 7-7: FLOWCHART OF A/D OPERATION Acquire ADON = 0 ADON = 0? GO = 0? A/D Clock GO = 0 ADIF = 0 Abort Conversion SLEEP Power-down A/D Wait 2 TAD Wake-up Yes No Yes No No Yes Finish Conversion GO = 0 ADIF = 1 Device in No Yes Finish Conversion GO = 0 ADIF = 1 Wait 2 TAD Stay in Sleep Selected Channel = RC? SLEEP No Yes Instruction? Start of A/D Conversion Delayed 1 Instruction Cycle From Sleep? Power-down A/D Yes No Wait 2 TAD Finish Conversion GO = 0 ADIF = 1 SLEEP? |
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