at90pwm81-16se ATMEL Corporation, at90pwm81-16se Datasheet - Page 153

• Manufacturer Part Number: at90pwm81-16se
• Description: 8-bit Avr Microcontroller With 8k Bytes In- System Programmable Flash
• Manufacturer: ATMEL Corporation

14.5.2.2
14.5.2.3
7734M–AVR–03/10
Two Ramp Mode
One Ramp Mode
In Two Ramp mode, the whole cycle is divided in two moments
One moment for PSCr0 description with OT0 which gives the time of the whole moment
One moment for PSCr1 description with OT1 which gives the time of the whole moment
Figure 14-5.
PSCOUTr0 and PSCOUTr1 signals are defined by On-Time 0, Dead-Time 0, On-Time 1 and Dead-Time
1 values with :
On-Time 0 = (OCRrRAH/L - OCRrSAH/L) * 1/Fclkpsc
On-Time 1 = (OCRrRBH/L - OCRrSBH/L) * 1/Fclkpsc
Dead-Time 0 = (OCRrSAH/L + 1) * 1/Fclkpsc
Dead-Time 1 = (OCRrSBH/L + 1) * 1/Fclkpsc
Note:
In One Ramp mode, PSCOUTr0 and PSCOUTr1 outputs can overlap each other.
PSC Counter
PSCOUTn0
PSCOUTn1
Minimal value for Dead-Time 0 and Dead-Time 1 = 1/Fclkpsc
OCRnSA
0
PSCr0 & PSCr1 Basic Waveforms in Two Ramp mode
Dead-Time 0
On-Time 0
PSC Cycle
OCRnRA
0
OCRnSB
Dead-Time 1
On-Time 1
OCRnRB
AT90PWM81
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