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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT89C51CC02CA-RATUM датащи(PDF) 127 Page - ATMEL Corporation |
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AT89C51CC02CA-RATUM датащи(HTML) 127 Page - ATMEL Corporation |
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127 / 159 page  127 AT/T89C51CC02 4126L–CAN–01/08 Figure 52. ADC Description Figure 53 shows the timing diagram of a complete conversion. For simplicity, the figure depicts the waveforms in idealized form and do not provide precise timing information. For ADC characteristics and timing parameters refer to the section “AC Characteristics” of this datasheet. Figure 53. Timing Diagram Note: Tsetup min, see the AC Parameter for A/D conversion. Tconv = 11 clock ADC = 1sample and hold + 10-bit conversion The user must ensure that Tsetup time between setting ADEN and the start of the first conversion. ADC Converter Operation A start of single A/D conversion is triggered by setting bit ADSST (ADCON.3). After completion of the A/D conversion, the ADSST bit is cleared by hardware. The end-of-conversion flag ADEOC (ADCON.4) is set when the value of conversion is available in ADDH and ADDL, it must be cleared by software. If the bit EADC (IEN1.1) is set, an interrupt occur when flag ADEOC is set (See Figure 55). Clear this flag for re- arming the interrupt. Note: Always leave Tsetup time before starting a conversion unless ADEN is permanently high. In this case one should wait Tsetup only before the first conversion Rai AN0/P1.0 AN1/P1.1 AN2/P1.2 AN3/P1.3 AN4/P1.4 AN5/P1.5 AN6/P1.6 AN7/P1.7 000 001 010 011 100 101 110 111 SCH2 ADCON.2 SCH0 ADCON.0 SCH1 ADCON.1 ADC CLOCK ADEN ADCON.5 ADSST ADCON.3 ADEOC ADCON.4 ADC Interrupt Request EADC IEN1.1 CONTROL AVSS Sample and Hold ADDH VAREF R/2R DAC VAGND 8 10 + - ADDL 2 SAR ADCIN Cai ADEN ADSST ADEOC T SETUP T CONV CLK |
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