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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega16 датащи(PDF) 237 Page - ATMEL Corporation |
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ATmega16 датащи(HTML) 237 Page - ATMEL Corporation |
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237 / 357 page  237 2466S–AVR–05/09 ATmega16(L) Scanning the ADC Figure 123 shows a block diagram of the ADC with all relevant control and observe signals. The Boundary-scan cell from Figure 122 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 123. Analog to Digital Converter The signals are described briefly in Table 92. Table 91. 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 + - + - 10x 20x G10 G20 ST ACLK AMPEN 2.56V ref IREFEN AREF VCCREN DAC_9..0 ADCEN HOLD GNDEN PASSEN ACTEN SCTEST ADCBGEN To Comparator 1.22V ref AREF |
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