atma5.05_ATmega2560
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To configure Timer1 on the ATmega2560 for a 1 kHz PWM signal with a 25% duty cycle on pin PB5 (OC1A), follow these steps:
Solution Code
include
int main {
// Set PB5 (OC1A) as output
DDRB |= (1 << DDB5);
// Reset Timer1 control registers
TCCR1A = 0;
TCCR1B = 0;
// Configure Timer1:
//
//
//
TCCR1A = (1 << COM1A1) | (1 << WGM11);
TCCR1B = (1 << WGM13) | (1 << WGM12) | (1 << CS11);
// Set TOP value for 1 kHz frequency (16 MHz clock, prescaler 8)
ICR1 = 1999; // TOP = (16e6 / (8 1000))
// Set duty cycle to 25% (OCR1A = 0.25 (ICR1 + 1) = 500)
OCR1A = 500;
// Main loop (do nothing, PWM runs in background)
while (1) {}
Explanation:
1. Pin Configuration:
`DDRB |= (1 << DDB5);` sets PB5 (OC1A) as an output.
2. Timer1 Mode Setup:
`TCCR1A |= (1 << WGM11);` and `TCCR1B |= (1 << WGM12) | (1 << WGM13);` configure Timer1 to use ICR1 as the TOP value.
`TCCR1A |= (1 << COM1A1);` clears OC1A on compare match and sets it at TOP.
3. Clock Prescaler:
`TCCR1B |= (1 << CS11);` sets a prescaler of 8, starting the timer.
4. Frequency Calculation (1 kHz):
`ICR1 = 1999;` sets the TOP value.
5. Duty Cycle (25%):
`OCR1A = 500;` sets the compare value (25% of 2000 = 500).
This setup generates a 1 kHz PWM signal on PB5 with a 25% duty cycle. The main loop remains idle while the timer hardware operates independently.
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