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ATtiny44 Datasheet(PDF) 109 Page - ATMEL Corporation |
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ATtiny44 Datasheet(HTML) 109 Page - ATMEL Corporation |
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109 / 236 page  109 8006H–AVR–10/09 ATtiny24/44/84 Table 12-3 shows the COM1x1:0 bit functionality when the WGM13:0 bits are set to the fast PWM mode. Note: 1. A special case occurs when OCR1A/OCR1B equals TOP and COM1A1/COM1B1 is set. In this case the compare match is ignored, but the set or clear is done at BOTTOM. “Fast PWM Mode” on page 97 for more details. Table 12-4 shows the COM1x1:0 bit functionality when the WGM13:0 bits are set to the phase correct or the phase and frequency correct, PWM mode. Note: 1. A special case occurs when OCR1A/OCR1B equals TOP and COM1A1/COM1B1 is set. “Phase Correct PWM Mode” on page 99 for more details. Table 12-2. Compare Output Mode, non-PWM COM1A1/COM1B1 COM1A0/COM1B0 Description 00 Normal port operation, OC1A/OC1B disconnected. 0 1 Toggle OC1A/OC1B on Compare Match. 10 Clear OC1A/OC1B on Compare Match (Set output to low level). 11 Set OC1A/OC1B on Compare Match (Set output to high level). Table 12-3. Compare Output Mode, Fast PWM(1) COM1A1/COM1B1 COM1A0/COM1B0 Description 00 Normal port operation, OC1A/OC1B disconnected. 01 WGM13=0: Normal port operation, OC1A/OC1B disconnected. WGM13=1: Toggle OC1A on Compare Match, OC1B reserved. 10 Clear OC1A/OC1B on Compare Match, set OC1A/OC1B at BOTTOM (non-inverting mode) 11 Set OC1A/OC1B on Compare Match, clear OC1A/OC1B at BOTTOM (inverting mode) Table 12-4. Compare Output Mode, Phase Correct and Phase & Frequency Correct PWM(1) COM1A1/COM1B1 COM1A0/COM1B0 Description 00 Normal port operation, OC1A/OC1B disconnected. 01 WGM13=0: Normal port operation, OC1A/OC1B disconnected. WGM13=1: Toggle OC1A on Compare Match, OC1B reserved. 10 Clear OC1A/OC1B on Compare Match when up- counting. Set OC1A/OC1B on Compare Match when downcounting. 11 Set OC1A/OC1B on Compare Match when up- counting. Clear OC1A/OC1B on Compare Match when downcounting. |
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