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ATMEGA640 Datasheet(PDF) 149 Page - ATMEL Corporation |
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ATMEGA640 Datasheet(HTML) 149 Page - ATMEL Corporation |
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149 / 449 page  149 ATmega640/1280/1281/2560/2561 2549K–AVR–01/07 A change of the COMnx1:0 bits state will have effect at the first compare match after the bits are written. For non-PWM modes, the action can be forced to have immediate effect by using the FOCnx strobe bits. Modes of Operation The mode of operation, i.e., the behavior of the Timer/Counter and the Output Compare pins, is defined by the combination of the Waveform Generation mode (WGMn3:0) and Compare Output mode (COMnx1:0) bits. The Compare Output mode bits do not affect the counting sequence, while the Waveform Generation mode bits do. The COMnx1:0 bits control whether the PWM output generated should be inverted or not (inverted or non-inverted PWM). For non-PWM modes the COMnx1:0 bits control whether the out- put should be set, cleared or toggle at a compare match (See “Compare Match Output Unit” on page 148.) Note: 1. The CTCn and PWMn1:0 bit definition names are obsolete. Use the WGMn2:0 definitions. However, the functionality and location of these bits are compatible with previous versions of the timer. For detailed timing information refer to “Timer/Counter Timing Diagrams” on page 157. Table 82. 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 00 0 0 0 Normal 0xFFFF Immediate MAX 10 0 0 1 PWM, Phase Correct, 8-bit 0x00FF TOP BOTTOM 20 0 1 0 PWM, Phase Correct, 9-bit 0x01FF TOP BOTTOM 30 0 1 1 PWM, Phase Correct, 10-bit 0x03FF TOP BOTTOM 4 0 1 0 0 CTC OCRnA Immediate MAX 50 1 0 1 Fast PWM, 8-bit 0x00FF BOTTOM TOP 60 1 1 0 Fast PWM, 9-bit 0x01FF BOTTOM TOP 70 1 1 1 Fast PWM, 10-bit 0x03FF BOTTOM TOP 81 0 0 0 PWM, Phase and Frequency Correct ICRn BOTTOM BOTTOM 91 0 0 1 PWM,Phase and Frequency Correct OCRnA BOTTOM BOTTOM 10 10 10 PWM, Phase Correct ICRn TOP BOTTOM 11 10 11 PWM, Phase Correct OCRnA TOP BOTTOM 12 1 1 0 0 CTC ICRn Immediate MAX 13 1 1 0 1 (Reserved) – – – 14 11 10 Fast PWM ICRn BOTTOM TOP 15 11 11 Fast PWM OCRnA BOTTOM TOP |
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