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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega328P датащи(PDF) 104 Page - ATMEL Corporation |
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ATmega328P датащи(HTML) 104 Page - ATMEL Corporation |
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104 / 448 page  104 8161D–AVR–10/09 ATmega48PA/88PA/168PA/328P symmetry around BOTTOM the OCnx 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 OCRnx, and for that reason misses the Compare Match and hence the OCnx change that would have happened on the way up. 14.8 Timer/Counter Timing Diagrams The Timer/Counter is a synchronous design and the timer clock (clk T0) is therefore shown as a clock enable signal in the following figures. The figures include information on when interrupt flags are set. Figure 14-8 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 14-8. Timer/Counter Timing Diagram, no Prescaling Figure 14-9 shows the same timing data, but with the prescaler enabled. Figure 14-9. Timer/Counter Timing Diagram, with Prescaler (f clk_I/O/8) Figure 14-10 shows the setting of OCF0B in all modes and OCF0A in all modes except CTC mode and PWM mode, where OCR0A is TOP. 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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