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ATtiny10 数据表(PDF) 75 Page - ATMEL Corporation |
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ATtiny10 数据表(HTML) 75 Page - ATMEL Corporation |
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75 / 168 page  75 8127C–AVR–10/09 ATtiny4/5/9/10 • Bits 1:0 – WGM01:0: Waveform Generation Mode Combined with WGM03:2 bits of TCCR0B, these bits control the counting sequence of the coun- ter, the source for maximum (TOP) counter value, and what type of waveform to generate. See Table 11-5. Modes of operation supported by the Timer/Counter unit are: Normal mode (coun- ter), Clear Timer on Compare match (CTC) mode, and three types of Pulse Width Modulation (PWM) modes. (“Modes of Operation” on page 62). 11.11.2 TCCR0B – Timer/Counter0 Control Register B • Bit 7 – ICNC0: 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 (ICP0) is filtered. The filter function requires four successive equal valued samples of the ICP0 pin for changing its output. The Input Capture is therefore delayed by four oscillator cycles when the noise canceler is enabled. • Bit 6 – ICES0: Input Capture Edge Select This bit selects which edge on the Input Capture pin (ICP0) that is used to trigger a capture event. When the ICES0 bit is written to zero, a falling (negative) edge is used as trigger, and when the ICES0 bit is written to one, a rising (positive) edge will trigger the capture. Table 11-5. Waveform Generation Modes Mode WGM 0 3:0 Mode of Operation TOP Update of OCR0 x at TOV0 Flag Set on 0 0000 Normal 0xFFFF Immediate MAX 1 0001 PWM, Phase Correct, 8-bit 0x00FF TOP BOTTOM 2 0010 PWM, Phase Correct, 9-bit 0x01FF TOP BOTTOM 3 0011 PWM, Phase Correct, 10-bit 0x03FF TOP BOTTOM 40100 CTC ( Clear Timer on Compare) OCR0A Immediate MAX 5 0101 Fast PWM, 8-bit 0x00FF TOP TOP 6 0110 Fast PWM, 9-bit 0x01FF TOP TOP 7 0111 Fast PWM, 10-bit 0x03FF TOP TOP 8 1000 PWM, Phase & Freq. Correct ICR0 BOTTOM BOTTOM 9 1001 PWM, Phase & Freq. Correct OCR0A BOTTOM BOTTOM 10 1010 PWM, Phase Correct ICR0 TOP BOTTOM 11 1011 PWM, Phase Correct OCR0A TOP BOTTOM 12 1100 CTC ( Clear Timer on Compare) ICR0 Immediate MAX 13 1101 (Reserved) – – – 14 1110 Fast PWM ICR0 TOP TOP 15 1111 Fast PWM OCR0A TOP TOP Bit 765 4 3 2 1 0 0x2D ICNC0 ICES0 – WGM03 WGM02 CS02 CS01 CS00 TCCR0B Read/Write R/W R/W R R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 |
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