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ATtiny48 Datasheet(PDF) 106 Page - ATMEL Corporation |
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ATtiny48 Datasheet(HTML) 106 Page - ATMEL Corporation |
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106 / 266 page  106 8008C–AVR–03/09 ATtiny48/88 Table 12-4 shows the COM1x1:0 bit functionality when the WGM13:0 bits are set to the phase correct or the phase and frequency correct, PWM mode. Note: 1. A special case occurs when OCR1A/OCR1B equals TOP and COM1A1/COM1B1 is set. See “Phase Correct PWM Mode” on page 98. for more details. • Bits 3,2 – Reserved These bits are reserved and will always read zero. • Bit 1:0 – WGM11:0: Waveform Generation Mode Combined with the WGM13:2 bits found in the TCCR1B 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 12-5. Table 12-4. Compare Output Mode, Phase Correct and Phase & Frequency Correct PWM(1) COM1A1 COM1B1 COM1A0 COM1B0 Description 0 0 Normal port operation, OC1A/OC1B disconnected. 01 WGM13:0 = 8, 9, 10 or 11: Toggle OC1A on Compare Match, OC1B disconnected (normal port operation). For all other WGM1 settings, normal port operation, OC1A/OC1B disconnected. 10 Clear OC1A/OC1B on Compare Match when up-counting. Set OC1A/OC1B on Compare Match when downcounting. 11 Set OC1A/OC1B on Compare Match when up-counting. Clear OC1A/OC1B on Compare Match when downcounting. Table 12-5. Waveform Generation Mode Bit Description Mode WGM 13 WGM 12 WGM 11 WGM 10 Timer/Counter Mode of Operation TOP Update of OCR1 x at TOV1 Flag Set on 000 00 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 401 00 CTC OCR1A Immediate MAX 501 01 Fast PWM, 8-bit 0x00FF TOP TOP 601 10 Fast PWM, 9-bit 0x01FF TOP TOP 701 11 Fast PWM, 10-bit 0x03FF TOP TOP 8 1 0 0 0 PWM, Phase & Frequency Correct ICR1 BOTTOM BOTTOM 9 1 0 0 1 PWM, Phase & Frequency Correct OCR1A BOTTOM BOTTOM 10 1 0 1 0 PWM, Phase Correct ICR1 TOP BOTTOM 11 1 0 1 1 PWM, Phase Correct OCR1A TOP BOTTOM 12 11 00 CTC ICR1 Immediate MAX 13 1 1 0 1 (Reserved) – – – 14 11 10 Fast PWM ICR1 TOP TOP 15 11 11 Fast PWM OCR1A TOP TOP |
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