Datasheet

109
7734Q–AVR–02/12
AT90PWM81/161
Figure 12-9. PSCn0 & PSCn1 basic waveforms in Center Aligned mode.
On-Time 0 = 2 × OCRnSAH/L × 1/Fclkpsc
On-Time 1 = 2 × (OCRnRBH/L - OCRnSBH/L + 1) × 1/Fclkpsc
Dead-Time = (OCRnSBH/L - OCRnSAH/L) × 1/Fclkpsc
PSC Cycle = 2 × (OCRnRBH/L + 1) × 1/Fclkpsc
Note: Minimal value for PSC Cycle = 2 × 1/Fclkpsc.
OCRnRAH/L is not used to control PSC Output waveform timing. Nevertheless, it can be useful
to adjust ADC synchronization (see
“Analog Synchronization” on page 131).
Figure 12-10. Run and stop mechanism in Centered mode.
Note: See “PCTL2 - PSC 2 Control Register” on page 140 (or PCTL1 or PCTL2).
On-Time 1
On-Time 0
PSCOUTn0
PSCOUTn1
PSC Cycle
Dead-Time
On-Time 1
Dead-Time
PSC Counter
OCRnRB
OCRnSA
OCRnSB
0
PSCOUTn0
PSC Counter
OCRnRB
OCRnSA
OCRnSB
0
Run
PSCOUTn1