What is ADC interrupt?

What is ADC interrupt?

The Analog-to-Digital Converter (ADC) can convert an analog input signal to a 10-bit binary digital representation of that signal. The ADC can also generate an interrupt upon completion of a conversion. This interrupt can be used to wake-up the device from SLEEP.

What is AVR interrupt?

Microcontrollers can accept inputs from I/O ports, interrupts are used for accepting inputs generated by external events. Interrupt event directs the flow of program execution with a totally independent piece of code, known as “Interrupt Sub-Routine”.

How does ADC work in AVR?

The ADC of the AVR converts analog signal into digital signal at some regular interval. This interval is determined by the clock frequency. In general, the ADC operates within a frequency range of 50kHz to 200kHz. But the CPU clock frequency is much higher (in the order of MHz).

How do I enable ADC interrupt?

Programming steps:

1. Set the value in ADMUX register according to the ADC channel and the reference voltage.
2. Set the Prescaler bits accordingly in ADCSRA register.
3. Set the ADEN bit to enable the ADC.
4. Set ADIE bit to enable ADC interrupt.
5. Set ADATE bit to enable auto triggering.
6. Set ADSC bit to start conversion.

What is the resolution of DAC0808?

IC DAC0808 Parameters

What is prescaler in ADC?

The ADC module contains a prescaler, which generates an acceptable ADC clock frequency from any CPU frequency above 100 kHz. The prescaling is set by the ADPS bits in ADCSRA. The prescaler starts counting from the moment the ADC is switched on by setting the ADEN bit in ADCSRA.

How do you interrupt in AVR?

Steps to configure the Interrupts:

1. Set INT1 and INT0 bits in the General Interrupt Control Register (GICR)
2. Configure MCU Control Register (MCUCR) to select interrupt type.
3. Set Global Interrupt(I-bit) Enable bit in the AVR Status Register(SREG)
4. Handle the interrupt in the Interrupt Service Routine code.

Why we use interrupt in AVR?

Interrupts, are perhaps one of the most important pieces that you need to understand for completing most of your micro-controller projects. Interrupts allow micro-controllers to continue doing their main job and provide mechanism to handle all other tasks which need the controller attention.

Which are the different features of ADC in AVR?

The ADC has 3 registers only:

• ADC Multiplexer Selection Register – ADMUX: For selecting the reference voltage and the input channel.
• ADC Control and Status Register A – ADCSRA: It has the status of ADC and is also used to control it.
• The ADC Data Register – ADCL and ADCH: Final result of the conversion is stored here.

Which register is used in controlling ADC conversion in AVR?

Explanation: For programming the ADC conversion in an AVR, we require the following registers. They are ADCSRA, ADMUX, SPIOR. There are two more registers used for handling the output data, they are ADCH and ADCL registers. 8.

What is ADC free running mode?

In free running mode, the ADC is constantly sampling and updating the ADC Data Registers. This mode is selected by the ADFR bit in the ADC Control and Status Register. The ADC is enabled by setting the ADC Enable bit, ADEN in ADCSR. This bit stays high until the conversion is complete (Hardware will clear the bit).

How many bit digital output does ADC produce?

3-bit Analogue-to-Digital Converter The parallel ADC above converts the analogue input voltage in the range from 0 to over 3 volts to produce a 2-bit binary code.