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ATMEGA640 датащи(PDF) 128 Page - Microchip Technology |
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ATMEGA640 датащи(HTML) 128 Page - Microchip Technology |
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128 / 436 page ![]() 128 ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET] DS40002211A Table 16-7 shows the COM0B1:0 bit functionality when the WGM02:0 bits are set to phase correct PWM mode. Note: 1. A special case occurs when OCR0B equals TOP and COM0B1 is set. In this case, the Compare Match is ignored, but the set or clear is done at TOP. See “Phase Correct PWM Mode” on page 122 for more details. • Bits 3, 2 – Res: Reserved Bits These bits are reserved bits and will always read as zero. • Bits 1:0 – WGM01:0: Waveform Generation Mode Combined with the WGM02 bit found in the TCCR0B 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 16-8. Modes of operation supported by the Timer/Counter unit are: Normal mode (counter), Clear Timer on Compare Match (CTC) mode, and two types of Pulse Width Modulation (PWM) modes (see “Modes of Operation” on page 144). Note: 1. MAX = 0xFF 2. BOTTOM = 0x00 Table 16-7. Compare Output Mode, Phase Correct PWM Mode(1) COM0B1 COM0B0 Description 0 0 Normal port operation, OC0B disconnected 01 Reserved 10 Clear OC0B on Compare Match when up-counting. Set OC0B on Compare Match when down-counting 11 Set OC0B on Compare Match when up-counting. Clear OC0B on Compare Match when down-counting Table 16-8. Waveform Generation Mode Bit Description Mode WGM2 WGM1 WGM0 Timer/Counter Mode of Operation TOP Update of OCRx at TOV Flag Set on(1)(2) 0 0 0 0 Normal 0xFF Immediate MAX 1 0 0 1 PWM, Phase Correct 0xFF TOP BOTTOM 20 10 CTC OCRA Immediate MAX 3 0 1 1 Fast PWM 0xFF TOP MAX 41 00 Reserved – – – 5 1 0 1 PWM, Phase Correct OCRA TOP BOTTOM 61 10 Reserved – – – 7 1 1 1 Fast PWM OCRA BOTTOM TOP |
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