AVR Microcontrollers Quiz

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.