at90pwm81-16se ATMEL Corporation, at90pwm81-16se Datasheet - Page 104

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

13.5
13.5.1
104
Functional Description
AT90PWM81
Waveform Cycles
Note:
The waveform generated by PSC can be described as a sequence of two waveforms.
The first waveform is relative to PSCOUTn0 output and part A of PSC. The part of this waveform is sub-
cycle A in the following figure.
The second waveform is relative to PSCOUTn1 output and part B of PSC. The part of this waveform is
sub-cycle B in the following figure.
The complete waveform is ended with the end of sub-cycle B. It means at the end of waveform B.
Figure 13-4.
Figure 13-5.
Ramps illustrate the output of the PSC counter included in the waveform generators. Centered Mode is
like a one ramp mode which count down up and down.
Notice that the update of a new set of values is done regardless of ramp Mode at the top of the last ramp.
4 Ramp Mode
2 Ramp Mode
1 Ramp Mode
Centered Mode
1. See
2.
Ramp A0
See “Analog Synchronization” on page 130.
Cycle Presentation in 1, 2 & 4 Ramp Mode
Cycle Presentation in Centered Mode
Figure 13-41 on page 131
Sub-Cycle A
Ramp A
Ramp A1
PSC Cycle
Ramp B0
Sub-Cycle B
Ramp B
Ramp B1
PSC Cycle
UPDATE
UPDATE
7734M–AVR–03/10