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ATtiny44 Datasheet(PDF) 110 Page - ATMEL Corporation |
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ATtiny44 Datasheet(HTML) 110 Page - ATMEL Corporation |
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110 / 236 page  110 8006H–AVR–10/09 ATtiny24/44/84 • 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 on page 110. 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. (“Modes of Operation” on page 96). 12.11.2 TCCR1B – Timer/Counter1 Control Register B • Bit 7 – ICNC1: Input Capture Noise Canceler Setting this bit (to one) activates the Input Capture Noise Canceler. When the noise canceler is activated, the input from the Input Capture pin (ICP1) is filtered. The filter function requires four successive equal valued samples of the ICP1 pin for changing its output. The Input Capture is therefore delayed by four Oscillator cycles when the noise canceler is enabled. • Bit 6 – ICES1: Input Capture Edge Select This bit selects which edge on the Input Capture pin (ICP1) that is used to trigger a capture event. When the ICES1 bit is written to zero, a falling (negative) edge is used as trigger, and when the ICES1 bit is written to one, a rising (positive) edge will trigger the capture. Table 12-5. Waveform Generation Modes Mode WGM 13:10 Mode of Operation TOP Update of OCR1 x at TOV1 Flag Set on 00000 Normal 0xFFFF Immediate MAX 10001 PWM, Phase Correct, 8-bit 0x00FF TOP BOTTOM 20010 PWM, Phase Correct, 9-bit 0x01FF TOP BOTTOM 30011 PWM, Phase Correct, 10-bit 0x03FF TOP BOTTOM 40100 CTC ( Clear Timer on Compare) OCR1A Immediate MAX 50101 Fast PWM, 8-bit 0x00FF TOP TOP 60110 Fast PWM, 9-bit 0x01FF TOP TOP 70111 Fast PWM, 10-bit 0x03FF TOP TOP 81000 PWM, Phase & Freq. Correct ICR1 BOTTOM BOTTOM 91001 PWM, Phase & Freq. Correct OCR1A BOTTOM BOTTOM 10 1010 PWM, Phase Correct ICR1 TOP BOTTOM 11 1011 PWM, Phase Correct OCR1A TOP BOTTOM 12 1100 CTC ( Clear Timer on Compare) ICR1 Immediate MAX 13 1101 (Reserved) – – – 14 1110 Fast PWM ICR1 TOP TOP 15 1111 Fast PWMOCR1A TOP TOP Bit 765 4 3 2 1 0 0x2E (0x4E) ICNC1 ICES1 – WGM13 WGM12 CS12 CS11 CS10 TCCR1B Read/Write R/W R/W RR/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 |
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