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ATMEGA640 Datasheet(PDF) 161 Page - ATMEL Corporation |
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ATMEGA640 Datasheet(HTML) 161 Page - ATMEL Corporation |
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161 / 449 page  161 ATmega640/1280/1281/2560/2561 2549K–AVR–01/07 . Table 84 shows the COMnx1:0 bit functionality when the WGMn3:0 bits are set to the fast PWM mode. Note: A special case occurs when OCRnA/OCRnB/OCRnC equals TOP and COMnA1/COMnB1/COMnC1 is set. In this case the compare match is ignored, but the set or clear is done at BOTTOM. See “Fast PWM Mode” on page 151. for more details. Table 85 shows the COMnx1:0 bit functionality when the WGMn3:0 bits are set to the phase correct and frequency correct PWM mode. Note: A special case occurs when OCRnA/OCRnB/OCRnC equals TOP and COMnA1/COMnB1//COMnC1 is set. See “Phase Correct PWM Mode” on page 153. for more details. Table 83. Compare Output Mode, non-PWM COMnA1 COMnB1 COMnC1 COMnA0 COMnB0 COMnC0 Description 00 Normal port operation, OCnA/OCnB/OCnC disconnected. 0 1 Toggle OCnA/OCnB/OCnC on compare match. 1 0 Clear OCnA/OCnB/OCnC on compare match (set output to low level). 1 1 Set OCnA/OCnB/OCnC on compare match (set output to high level). Table 84. Compare Output Mode, Fast PWM COMnA1 COMnB1 COMnC1 COMnA0 COMnB0 COMnC0 Description 00 Normal port operation, OCnA/OCnB/OCnC disconnected. 01 WGM13:0 = 14 or 15: Toggle OC1A on Compare Match, OC1B and OC1C disconnected (normal port operation). For all other WGM1 settings, normal port operation, OC1A/OC1B/OC1C disconnected. 1 0 Clear OCnA/OCnB/OCnC on compare match, set OCnA/OCnB/OCnC at BOTTOM (non-inverting mode). 1 1 Set OCnA/OCnB/OCnC on compare match, clear OCnA/OCnB/OCnC at BOTTOM (inverting mode). Table 85. Compare Output Mode, Phase Correct and Phase and Frequency Correct PWM COMnA1 COMnB1 COMnC1 COMnA0 COMnB0 COMnC0 Description 00 Normal port operation, OCnA/OCnB/OCnC disconnected. 01 WGM13:0 =9 or 11: Toggle OC1A on Compare Match, OC1B and OC1C disconnected (normal port operation). For all other WGM1 settings, normal port operation, OC1A/OC1B/OC1C disconnected. 1 0 Clear OCnA/OCnB/OCnC on compare match when up-counting. Set OCnA/OCnB/OCnC on compare match when downcounting. 1 1 Set OCnA/OCnB/OCnC on compare match when up-counting. Clear OCnA/OCnB/OCnC on compare match when downcounting. |
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