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Questions and Answers
How can the Timer/Counter register TCNT0 be updated?
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?
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?
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?
What is the purpose of the Output Compare Registers OCR0A and OCR0B?
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What is the function of the Waveform Generator in relation to the Output Compare pins?
What is the function of the Waveform Generator in relation to the Output Compare pins?
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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 likemillis(),micros(), andanalogWrite().
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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