AVR MCU Timer/Counter Study Notes (Part 2)-EEWORLD

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Timer/Counter 1 (16-bit) has normal mode, CTC mode, fast PWM mode, phase correction PWM mode and other operating modes.

2. CTC mode (need to use OC1A and OC1B pins)

Application: Used to generate a square wave signal with a duty cycle of 50%

[Reprint] AVR MCU Timer/Counter Study Notes (Part 2)

(N is the frequency division coefficient)

Registers that need to be configured: Timer/C1 Control Register A (TCCR1A), Timer/C1 Control Register B (TCCR1B), Output Compare Register 1A (OCR1A).

(1) Bit7 and bit6 of TCCR1A are used to set the comparison output mode of the OC1A pin, and bit5 and bit4 are used to set the comparison output mode of the OC1B pin. (Here we set it so that the OC1A and OC1B levels are inverted when the comparison matches)

(2) Bit 4 and bit 3 of TCCR1B and bit 1 and bit 0 of TCCR1A are combined to set the waveform generation mode. (Here we set it to mode 4 - CTC mode)

(3) Bit 2, bit 1, and bit 0 of TCCR1B set the clock frequency.

(4) OCR1A is used to set the upper limit of the count

Routine:

#include

void main()

{

DDRD|=0X30; //PD4, PD5 are set as output

TCCR1A=0X50; //Compare and match and invert

TCCR1B=0X09; //CTC mode, no pre-scaling

OCR1A=1999; //OC1A and OC1B both generate 2KHz square wave signals (system clock is 8MHz)

}

Keywords：AVR Reference address：AVR MCU Timer/Counter Study Notes (Part 2)

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