Table of Contents
- 1 What is the maximum number of instructions that can fit in the Flash memory of an ATMEGA328P?
- 2 Which are the different features of ADC in AVR?
- 3 What is prescaler in ADC?
- 4 What is the meaning of 328 in Atmega328?
- 5 What is Aref ATmega328?
- 6 What is Ioref Arduino?
- 7 How many levels can an ADC map the 0-2v analog voltage?
- 8 How to convert analog voltage to digital voltage in microcontroller?
What is the maximum number of instructions that can fit in the Flash memory of an ATMEGA328P?
Features
| Parameter | Value |
|---|---|
| CPU type | 8-bit AVR |
| Maximum CPU speed | 20 MHz |
| Performance | 20 MIPS at 20 MHz |
| Flash memory | 32 KB |
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.
What is the function of the AREF pin in the Arduino Uno?
AREF means Analog REFerence. It allows us to feed the Arduino a reference voltage from an external power supply in order to configure the reference voltage used for analog input (i.e. the value used as the top of the input range).
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.
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.
What is the meaning of 328 in Atmega328?
Atmega 328 is a 8-bit AVR Microcontroller with 32 kilo bytes of FLASH program memory. So basically 32 and 8 gives information about memory. For further information look into datasheet. 4K views.
How much power does ATmega328P use?
The ATmega328P, used on popular boards like the SparkFun RedBoard, Arduino Uno, and Pro Mini are actually quite power hungry. The RedBoard and Arduino Uno, draw around 15mA minimum, which doesn’t sound like much but as you’ll see in this guide, we can drastically bring that down with just a few tricks.
How many GPIO pins atmega16 have?
Each port has 8 pins. The pins of these four ports can be used as general-purpose inputs/outputs.
What is Aref ATmega328?
The Aref pin is used for an external voltage reference. If you attach it to 5V then you can’t attach it to an external reference voltage. With it disconnected you can program the pin to internally connect to 5V.
What is Ioref Arduino?
IOREF: This pin on the Arduino/Genuino board provides the voltage reference with which the microcontroller operates. A properly configured shield can read the IOREF pin voltage and select the appropriate power source, or enable voltage translators on the outputs to work with the 5V or 3.3V.
What is the resolution of 10 bit ADC of 5V?
Parameters
| Resolution (bits) (ADC) | 10 |
|---|---|
| Data Bus | SPI |
| ADC Architecture | SAR |
| Diff/S.E. Input | Both |
| Internal VREF (V) (nominal) | 4.096 |
What is the ADC range of a microcontroller?
This will vary for different types of Microcontrollers. Let us assume that our ADC range is from 0V to 5V and we have a 10-bit ADC this means our input voltage 0-5 Volts will be split into 1024 levels of discrete analog values (2 10 = 1024).
How many levels can an ADC map the 0-2v analog voltage?
Here we are taking example of ADC which has 3 bit resolution and 2V reference voltage. So it can map the 0-2v analog voltage with 8 (2 3) different levels, like shown in the below picture: So if analog voltage is 0.25 then the digital value will be 1 in decimal and 001 in binary.
How to convert analog voltage to digital voltage in microcontroller?
Likewise if analog voltage is 0.5 then the digital value will be 2 in decimal and 010 in binary. Some microcontroller has inbuilt ADC like Arduino, MSP430, PIC16F877A but some microcontroller don’t have it like 8051, Raspberry Pi etc and we have to use some external Analog to digital converter ICs like ADC0804, ADC0808.
What is the reference voltage for the AREF pin in Arduino?
EXTERNAL: the voltage applied to the AREF pin (0 to 5V only) is used as the reference. Arduino SAMD Boards (Zero, etc.) AR_DEFAULT: the default analog reference of 3.3V