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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega325P датащи(PDF) 145 Page - ATMEL Corporation |
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ATmega325P датащи(HTML) 145 Page - ATMEL Corporation |
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145 / 364 page  145 8023F–AVR–07/09 ATmega325P/3250P symmetry around BOTTOM the OCn value at MAX must correspond to the result of an up- counting Compare Match. • The timer starts counting from a value higher than the one in OCR2A, and for that reason misses the Compare Match and hence the OCn change that would have happened on the way up. 16.8 Timer/Counter Timing Diagrams The following figures show the Timer/Counter in synchronous mode, and the timer clock (clk T2) is therefore shown as a clock enable signal. In asynchronous mode, clk I/O should be replaced by the Timer/Counter Oscillator clock. The figures include information on when Interrupt Flags are set. Figure 16-8 contains timing data for basic Timer/Counter operation. The figure shows the count sequence close to the MAX value in all modes other than phase correct PWM mode. Figure 16-8. Timer/Counter Timing Diagram, no Prescaling Figure 16-9 shows the same timing data, but with the prescaler enabled. Figure 16-9. Timer/Counter Timing Diagram, with Prescaler (f clk_I/O/8) Figure 16-10 shows the setting of OCF2A in all modes except CTC mode. clk Tn (clk I/O/1) TOVn clk I/O TCNTn MAX - 1 MAX BOTTOM BOTTOM + 1 TOVn TCNTn MAX - 1 MAX BOTTOM BOTTOM + 1 clk I/O clk Tn (clk I/O/8) |
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