Datasheet

106
7734Q–AVR–02/12
AT90PWM81/161
Figure 12-6. PSCn0 & PSCn1 basic waveforms in Four Ramp mode.
The input clock of PSC is given by CLKPSC.
PSCOUTn0 and PSCOUTn1 signals are defined by On-Time 0, Dead-Time 0, On-Time 1 and
Dead-Time 1 values with:
On-Time 0 = OCRnRAH/L × 1/Fclkpsc
On-Time 1 = OCRnRBH/L × 1/Fclkpsc
Dead-Time 0 = (OCRnSAH/L + 2) × 1/Fclkpsc
Dead-Time 1 = (OCRnSBH/L + 2) × 1/Fclkpsc
Note: Minimal value for Dead-Time 0 and Dead-Time 1 = 2 × 1/Fclkpsc.
12.5.2.2 Two Ramp Mode
In Two Ramp mode, the whole cycle is divided in two moments:
One moment for PSCn0 description with OT0 which gives the time of the whole moment.
One moment for PSCn1 description with OT1 which gives the time of the whole moment.
On-Time 0 On-Time 1
PSCOUTn0
PSCOUTn1
Dead-Time 1
Dead-Time 0
PSC Cycle
OCRnRB
OCRnSB
OCRnRA
OCRnSA
PSC Counter
00