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AT90PWM2 Datasheet(PDF) 145 Page - ATMEL Corporation |
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AT90PWM2 Datasheet(HTML) 145 Page - ATMEL Corporation |
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145 / 365 page  145 AT90PWM2/3 4317A-3–AVR–02/05 Figure 66. Resulting Frequency versus d. Modes of Operation Normal Mode The simplest mode of operation is the normal mode. See Figure 60. The active time of PSCOUTn0 is given by the OT0 value. The active time of PSCOUTn1 is given by the OT1 value. Both of them are 12 bit values. Thanks to DT0 & DT1 to ajust the dead time between PSCOUTn0 and PSCOUTn1 active signals. The waveform frequency is defined by the following equation: Enhanced Mode The Enhanced Mode uses the previously described method to generate a high resolu- tion frequency. Figure 67. Enhanced Mode, Timing Diagram The supplementary step in counting to generate f b2 is added on the PSCn0 signal while needed in the frame according to the fractional divider. SeeTable 56, “Distribution of fb2 in the modulated frame,” on page 144. The waveform frequency is defined by the following equations: fb1 fb2 d: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 f OP f PSCn 1 PSCnCycle ------------------------------ = fCLK_PSCn OT0 OT1 DT0 DT1 +++ () ---------------------------------------------------------------------- 1 == = PSCOUTn0 T1 Period PSCOUTn1 OT0 OT1 DT1 DT0 T2 OT0+1 OT1 DT1 DT0 DT0 f1 PSCn 1 T1 ------ f CLK_PSCn OT0 OT1 DT0 DT1 +++ () ---------------------------------------------------------------------- == f2 PSCn 1 T 2 ------ fCLK_PSCn OT0 OT1 DT0 DT11 ++++ () -------------------------------------------------------------------------------- == |
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