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AT90USB646 Datasheet(PDF) 138 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 138 Page - ATMEL Corporation |
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138 / 456 page  138 7593L–AVR–09/12 AT90USB64/128 Note: A special case occurs when OCRnA/OCRnB/OCRnC equals TOP and COMnA1/COMnB1//COMnC1 is set. See “Phase correct PWM mode” on page 106. for more details. • 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 wave- form generation to be used, see Table 15-4 on page 138. 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. (See “Modes of operation” on page 103.). Table 15-3. Compare Output mode, phase correct and phase and frequency correct PWM. COMnA1/COMnB/ COMnC1 COMnA0/COMnB0/ COMnC0 Description 00 Normal port operation, OCnA/OCnB/OCnC disconnected. 01 WGM13:0 = 8, 9 10 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 counting down. 11 Set OCnA/OCnB/OCnC on compare match when up-counting. Clear OCnA/OCnB/OCnC on compare match when counting down. Table 15-4. Waveform Generation mode bit description (1). Mode WGMn3 WGMn2 (CTCn) WGMn1 (PWMn1) WGMn0 (PWMn0) Timer/Counter mode of operation TOP Update of OCRn x at TOVn flag set on 0 0 0 0 0 Normal 0xFFFF Immediate MAX 1 0 0 0 1 PWM, phase correct, 8-bit 0x00FF TOP BOTTOM 2 0 0 1 0 PWM, phase correct, 9-bit 0x01FF TOP BOTTOM 3 0 0 1 1 PWM, phase correct, 10-bit 0x03FF TOP BOTTOM 4 0 1 0 0 CTC OCRnA Immediate MAX 5 0 1 0 1 Fast PWM, 8-bit 0x00FF TOP TOP 6 0 1 1 0 Fast PWM, 9-bit 0x01FF TOP TOP 7 0 1 1 1 Fast PWM, 10-bit 0x03FF TOP TOP 8 100 0 PWM, phase and frequency Correct ICRn BOTTOM BOTTOM 9 100 1 PWM, phase and frequency Correct OCRnA BOTTOM BOTTOM 10 1 0 1 0 PWM, phase correct ICRn TOP BOTTOM |
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