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ATMEGA640 Datasheet(PDF) 155 Page - Microchip Technology |
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ATMEGA640 Datasheet(HTML) 155 Page - Microchip Technology |
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155 / 436 page  155 ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET] DS40002211A • Bit 1:0 – WGMn1:0: Waveform Generation Mode Combined with the WGMn3:2 bits found in the TCCRnB Register, these bits control the counting sequence of the counter, the source for maximum (TOP) counter value, and what type of waveform generation to be used, see Table 17-2 on page 145. Modes of operation supported by the Timer/Counter unit are: Normal mode (counter), Clear Timer on Compare match (CTC) mode, and three types of Pulse Width Modulation (PWM) modes. For more information on the different modes, see “Modes of Operation” on page 144. Table 17-4 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 146. for more details. Table 17-5 shows the COMnx1:0 bit functionality when the WGMn3:0 bits are set to the phase correct and fre- quency correct PWM mode. Table 17-3. Compare Output Mode, non-PWM COMnA1 COMnB1 COMnC1 COMnA0 COMnB0 COMnC0 Description 0 0 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 17-4. Compare Output Mode, Fast PWM COMnA1 COMnB1 COMnC1 COMnA0 COMnB0 COMnC0 Description 0 0 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 10 Clear OCnA/OCnB/OCnC on compare match, set OCnA/OCnB/OCnC at BOTTOM (non-inverting mode) 11 Set OCnA/OCnB/OCnC on compare match, clear OCnA/OCnB/OCnC at BOTTOM (inverting mode) Table 17-5. Compare Output Mode, Phase Correct and Phase and Frequency Correct PWM COMnA1 COMnB1 COMnC1 COMnA0 COMnB0 COMnC0 Description 0 0 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 10 Clear OCnA/OCnB/OCnC on compare match when up-counting Set OCnA/OCnB/OCnC on compare match when downcounting 11 Set OCnA/OCnB/OCnC on compare match when up-counting Clear OCnA/OCnB/OCnC on compare match when downcounting |
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