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ATmega324P Datasheet(PDF) 134 Page - ATMEL Corporation |
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ATmega324P Datasheet(HTML) 134 Page - ATMEL Corporation |
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134 / 377 page ![]() 134 7674F–AVR–09/09 ATmega164P/324P/644P 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. 14.11.2 TCCR1B – Timer/Counter1 Control Register B • Bit 7 – ICNCn: 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 (ICPn) is filtered. The filter function requires four successive equal valued samples of the ICPn pin for changing its output. The Input Capture is therefore delayed by four Oscillator cycles when the noise canceler is enabled. • Bit 6 – ICESn: Input Capture Edge Select This bit selects which edge on the Input Capture pin (ICPn) that is used to trigger a capture event. When the ICESn bit is written to zero, a falling (negative) edge is used as trigger, and when the ICESn bit is written to one, a rising (positive) edge will trigger the capture. When a capture is triggered according to the ICESn setting, the counter value is copied into the Input Capture Register (ICRn). The event will also set the Input Capture Flag (ICFn), and this can be used to cause an Input Capture Interrupt, if this interrupt is enabled. Table 14-5. 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 0 0 0 0 0 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 4 0 1 0 0 CTC OCRnA Immediate MAX 5 0 1 0 1 Fast PWM, 8-bit 0x00FF BOTTOM TOP 6 0 1 1 0 Fast PWM, 9-bit 0x01FF BOTTOM TOP 7 0 1 1 1 Fast PWM, 10-bit 0x03FF BOTTOM TOP 8 100 0 PWM, Phase and Frequency Correct ICRn BOTTOM BOTTOM 9 100 1 PWM, Phase and Frequency Correct OCRnA BOTTOM BOTTOM 10 1 0 1 0 PWM, Phase Correct ICRn TOP BOTTOM 11 1 0 1 1 PWM, Phase Correct OCRnA TOP BOTTOM 12 1 1 0 0 CTC ICRn Immediate MAX 13 1 1 0 1 (Reserved) – – – 14 1 1 1 0 Fast PWM ICRn BOTTOM TOP 15 1 1 1 1 Fast PWM OCRnA BOTTOM TOP Bit 765 4 3 2 1 0 (0x81) ICNC1 ICES1 – WGM13 WGM12 CS12 CS11 CS10 TCCR1B Read/Write R/W R/W R R/W R/W R/W R/W R/W Initial Value000 0 0 0 0 0 |
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