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AT90USB646 Datasheet(PDF) 138 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 138 Page - ATMEL Corporation |
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138 / 434 page  138 7593A–AVR–02/06 AT90USB64/128 Figure 14-11. Timer/Counter Timing Diagram, Setting of OCFnx, with Prescaler (f clk_I/O/8) Figure 14-12 shows the count sequence close to TOP in various modes. When using phase and frequency correct PWM mode the OCRnx Register is updated at BOTTOM. The timing diagrams will be the same, but TOP should be replaced by BOTTOM, TOP-1 by BOTTOM+1 and so on. The same renaming applies for modes that set the TOVn Flag at BOTTOM. Figure 14-12. Timer/Counter Timing Diagram, no Prescaling Figure 14-13 shows the same timing data, but with the prescaler enabled. OCFnx OCRnx TCNTn OCRnx Value OCRnx - 1 OCRnx OCRnx + 1 OCRnx + 2 clk I/O clk Tn (clk I/O/8) TOVn (FPWM) and ICFn (if used as TOP) OCRnx (Update at TOP) TCNTn (CTC and FPWM) TCNTn (PC and PFC PWM) TOP - 1 TOP TOP - 1 TOP - 2 Old OCRnx Value New OCRnx Value TOP - 1 TOP BOTTOM BOTTOM + 1 clk Tn (clk I/O/1) clk I/O |
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