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ATmega128 Datasheet(PDF) 132 Page - ATMEL Corporation |
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ATmega128 Datasheet(HTML) 132 Page - ATMEL Corporation |
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132 / 386 page  132 2467S–AVR–07/09 ATmega128 Figure 57 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 57. Timer/Counter Timing Diagram, no Prescaling Figure 58 shows the same timing data, but with the prescaler enabled. Figure 58. Timer/Counter Timing Diagram, with Prescaler (f 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 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 I/O clk Tn (clk I/O/8) |
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