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Questions and Answers
What is the architecture of AVR Microcontroller?
What is the voltage range of the ATmega32 controller?
What is the purpose of the watchdog timer?
What is the time taken to respond to an interrupt called?
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What type of memory retains its content when power is removed?
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What type of interrupt generates a fast interrupt exception?
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Which type of memory is UV erasable?
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How many different general modes does a Timer have?
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How many different pin sources does an External Interrupt have?
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Study Notes
AVR Microcontrollers
- AVR is a family of microcontrollers developed by Atmel company.
- AVR Microcontroller has a Harvard architecture.
- AVR is an 8-bit RISC Single chip microcontroller.
GPIO and Registers
- Each GPIO port is controlled by three 8-bit registers.
- DDRx registers configure the pins as input or output.
- PORTx sets the output values on pins configured as outputs.
- PORTx enables or disables the pull-up resistor on pins configured as inputs.
- PINx Input register reads an input signal.
ATMega 32 AVR Microcontroller
- ATMega 32 AVR Microcontroller has 4 kilo bytes of internal static RAM.
- ATMega 32 AVR Microcontroller has 1024 bytes of EEPROM.
- Atmega 32 AVR has one 16-bit timer/counter with a separate Prescaler.
- Atmega 32 AVR has 32 Programmable I/O lines.
- ATmega32 controller operates from 1.8 to 5.5 volts.
Watchdog Timer and Interrupts
- The watchdog timer resets the system in case of invalid behavior.
- The time taken to respond to an interrupt is called interrupt latency.
- Timer is used in the generation of waveforms.
Processor and Memory
- DSP (Digital Signal Processor) is designed to perform calculations in graphics rendering.
- Coprocessor helps in floating point calculations.
- Flash memory is widely used in PCs and Embedded Systems.
- EEPROM is a type of nonvolatile memory.
- OTP (One-Time Programmable) memory has EPROM.
- External interrupts generate fast interrupt exception.
Timer and Interrupt Handling
- TOV0 is cleared by writing logic one when executing the corresponding interrupt handling vector.
- Timer has 4 different general modes.
- External interrupt has 4 different pin sources.
- TOV0 is cleared by writing logic one when executing the corresponding interrupt handling vector.
- Timer starts counting from zero to maximum value in normal mode.
- Timer0 has 4 different wave generation modes.
- To stop timer0, clear three Clock Select bits.
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Description
Test your knowledge of AVR microcontrollers, their architecture, and features. Questions cover the type of processor, architecture, and register configuration.
