As the counter counts, its output to the D A C generates a staircase ramp toControl LogicD A CCounterSTARTVinComparatorDigital Outputclockthe comparator. As the Clock sends regular pulses to the counter, the counter outputs adigital signal to the Digital-to-Analog converterD A CCounterSTARTVinComparatorDigital OutputclockControl Logic 13. Counter TypeControl LogicD A CCounterSTARTVinComparatorDigital OutputclockWhen START is received,control logic initializes the system, (sets counter to 0), andturns on Clock sending regular pulses to the counter. ADCSRA(ADC STATUS AND CONTROL REGISTER)Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0ADEN ADSC ADATE ADIF ADIE ADPS2 ADPS1 ADPS00 0 0 0 0 0 0 0 Initial valueADCenableADCstartconversionAutotriggerenableInterrupt flagInterruptenableADC pre scale factor1 1 0 0 0 1 1 1 10.
ADMUX(ADC MULTIPLEXER SELECTION REGISTER)Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0REFS1 REFS0 ADLAR MUX 4 MUX 3 MUX 2 MUX 1 MUX 00 0 0 0 0 0 0 0 Initial valueREFS1 REFS0 Vref0 0 OFF0 1 5V1 0 REVERSE1 1 2.56V0 1 0 0 0 0 0 0 9. ADCSRA(ADC Status and Control Register)C. ADMUX(ADC Multiplexer Selection Register)B.
REGISTERS OF ADC There are four type of register which we use in ADCA. NEED OF ADC IN EMBEDDEDThe microcontroller is a digital device so it needsdigital input to process.But a number of input devices available which givesanalog signal.So its necessary to convert analog signals to digitalsignalsIts done by Analog to Digital Circuit inside amicrocontroller. ANALOG-TO-DIGITAL CONVERSIONTerminologyanalog: continuously valued signal, such as temperature orspeed, with infinite possible values in betweendigital: discretely valued signal, such as integers, encoded inbinaryAn embedded systems surroundings typically involve manyanalog signals. DEFINITIONAn analog-to-digital converter, or ADC as it is more commonlycalled, is a device that converts analog signals into digitalsignals.ORAn analog-to-digital converter (ADC, A/D, or A to D) is a devicethat converts a continuous physical quantity (usually voltage) toa digital number that represents the quantity's amplitude 4. CONTENTS Definition Need of ADC in EMBEDDEDRegisters of ADCTypes of ADCApplications 3. Analog to Digital ConverterSUBMITTED BY:-Madhusudhan AgarwalĢ.
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