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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega325P датащи(PDF) 237 Page - ATMEL Corporation |
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ATmega325P датащи(HTML) 237 Page - ATMEL Corporation |
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237 / 364 page  237 8023F–AVR–07/09 ATmega325P/3250P 23.5.5 Scanning the ADC Figure 23-8 shows a block diagram of the ADC with all relevant control and observe signals. The Boundary-scan cell from Figure 23-4 is attached to each of these signals. The ADC need not be used for pure connectivity testing, since all analog inputs are shared with a digital port pin as well. Figure 23-8. Analog to Digital Converter The signals are described briefly in Table 23-4. Table 23-3. Boundary-scan Signals for the Analog Comparator Signal Name Direction as Seen from the Comparator Description Recommended Input when Not in Use Output Values when Recommended Inputs are Used AC_IDLE input Turns off Analog Comparator when true 1 Depends upon µC code being executed ACO output Analog Comparator Output Will become input to µC code being executed 0 ACME input Uses output signal from ADC mux when true 0 Depends upon µC code being executed ACBG input Bandgap Reference enable 0 Depends upon µC code being executed 10-bit DAC + - AREF PRECH DACOUT COMP MUXEN_7 ADC_7 MUXEN_6 ADC_6 MUXEN_5 ADC_5 MUXEN_4 ADC_4 MUXEN_3 ADC_3 MUXEN_2 ADC_2 MUXEN_1 ADC_1 MUXEN_0 ADC_0 NEGSEL_2 ADC_2 NEGSEL_1 ADC_1 NEGSEL_0 ADC_0 EXTCH + - 1x ST ACLK AMPEN 1.11V ref IREFEN AREF VCCREN DAC_9..0 ADCEN HOLD PRECH GNDEN PASSEN COMP SCTEST ADCBGEN To Comparator 1.22V ref ACTEN AREF |
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