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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC16C745/P датащи(PDF) 91 Page - Microchip Technology |
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PIC16C745/P датащи(HTML) 91 Page - Microchip Technology |
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91 / 158 page  © 1999 Microchip Technology Inc. Advanced Information DS41124A-page 91 PIC16C745/765 The following steps should be followed for doing an A/D conversion: 1. Configure the A/D module: • Configure analog pins / voltage reference / and digital I/O (ADCON1) • Select A/D input channel (ADCON0) • Select A/D conversion clock (ADCON0) • Turn on A/D module (ADCON0) 2. Configure A/D interrupt (if desired): • Clear ADIF bit • Set ADIE bit • Set GIE bit 3. Wait the required acquisition time. 4. Start conversion: • Set GO/DONE bit (ADCON0) 5. Wait for A/D conversion to complete, by either: • Polling for the GO/DONE bit to be cleared OR • Waiting for the A/D interrupt 6. Read A/D result register (ADRES), clear bit ADIF if required. 7. For next conversion, go to step 1 or step 2 as required. The A/D conversion time per bit is defined as TAD. A minimum wait of 2TAD is required before next acquisition starts. FIGURE 12-1: A/D BLOCK DIAGRAM (Input voltage) VIN VREF (Reference voltage) VDD PCFG<2:0> CHS<2:0> 000 or 010 or 100 or 001 or 011 or 101 RE2/AN7(1) RE1/AN6(1) RE0/AN5(1) RA5/AN4 RA3/AN3/VREF RA2/AN2 RA1/AN1 RA0/AN0 111 110 101 100 011 010 001 000 A/D Converter Note 1: Not available on PIC16C745. 11x |
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