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ATMEGA328P Timer/Counter Quiz

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Questions and Answers

How can the Timer/Counter register TCNT0 be updated?

By control logic only

By clock select block

By control logic or CPU written/read through the data bus (correct)

By CPU written/read through the data bus only

What happens if no clock source is selected for the Timer/Counter register TCNT0?

The TC will reset to zero

The TC will count at maximum speed

The TC will be disabled or inactive (correct)

The TC will continue with the previous clock source

How is the source of the clock determined for the Timer/Counter register TCNT0?

Through the control logic

Only through the CPU

Exclusively via a special pin

Internally via a prescaler or externally via a special pin (correct)

What is the purpose of the Output Compare Registers OCR0A and OCR0B?

<p>The TC value is continuously compared to them</p> Signup and view all the answers

What is the function of the Waveform Generator in relation to the Output Compare pins?

<p>It generates a PWM or variable frequency output</p> Signup and view all the answers

Study Notes

Overview of ATmega328P Timers and Counters

ATmega328P features three timer/counters: TC0, TC1, and TC2.
TC0 and TC2 are both 8-bit timers with a maximum count of 255.
TC1 is a 16-bit timer with a maximum count of 65,535.

Initialization and Functions

All timer/counters are disabled upon power-on or reset and must be enabled via software.
Arduino's init() function initializes timer/counter settings for proper functioning of functions like millis(), micros(), and analogWrite().

Timer/Counter Operation

Timer/counters serve dual functions:
- Timing: Counts up and down using the internal system clock when operating as a timer.
- Counting: Counts up and down based on external rising or falling edges on designated pins when operating as a counter.

Key Characteristics

Timer/counters provide flexibility in applications requiring precise timing or event counting.
The performance and capability are dictated by the bit resolution (8-bit vs. 16-bit) which determines the maximum count value.

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Description

Test your knowledge of ATMEGA328P hardware by taking this quiz on timers and counters. Explore timer/counter introduction, block diagram, registers, and examples of normal and CTC modes. Get ready to dive into the specifics of the ATMEGA328P's timer/counter functionality.