at90pwm81-16se ATMEL Corporation, at90pwm81-16se Datasheet - Page 115

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

13.8.1
13.8.2
7734M–AVR–03/10
PSC Retrigger Behavior versus PSC running modes
Retrigger PSCOUTn0 On External Event
Figure 13-15. PSC Input Module B
In centered mode, Retrigger Inputs have no effect.
In two ramp or four ramp mode, Retrigger Inputs A or B cause the end of the corresponding cycle A or B
and the beginning of the following cycle B or A.
In one ramp mode, Retrigger Inputs A or B reset the current PSC counting to zero.
PSCOUTn0 output can be reset before end of On-Time 0 on the change on PSCn Input A. PSCn Input A
can be configured to do not act or to act on level or edge modes. The polarity of PSCn Input A is configu-
rable thanks to a sense control block. PSCn Input A can be the Output of the analog comparator or the
PSCINn input.
As the period of the cycle decreases, the instantaneous frequency of the two outputs increases.
PSCINn
AC2 O: Analog
Comparator
Output
PSCINnA
AC3 O:Analog
Comparator
Output
PISELnB1
0
0
1
1
0
1
0
1
PISELnB0
PSC n Input B
PCAEnB
PELE VnB
PRFM nB3:0
Digital
Filter
CLK
PSC
PAO CnB
PFLTEnB
0
1
CLK
CLK
4
PSC
PSC
Input
Proces sing
(retriggering ...)
PSC C o re
(Counter,
Wav eform
Generator, ...)
Output
Control
AT90PWM81
PSCOUT n0
(PSCOUT n1)
(PSCOUT22
(PSCOUT23
115