at90pwm81-16se ATMEL Corporation, at90pwm81-16se Datasheet - Page 156
at90pwm81-16se
Manufacturer Part Number
at90pwm81-16se
Description
8-bit Avr Microcontroller With 8k Bytes In- System Programmable Flash
Manufacturer
ATMEL Corporation
Datasheet
1.AT90PWM81-16SE.pdf
(323 pages)
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14.8.1
14.8.2
156
AT90PWM81
PSCR Retrigger Behavior versus PSCR running modes
Retrigger PSCOUTr0 On External Event
Figure 14-8.
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 PSCR counting to zero.
PSCOUTr0 output can be reset before end of On-Time 0 on the change on PSCr Input A. PSCr Input A
can be configured to do not act or to act on level or edge modes. The polarity of PSCr Input A is configu-
rable thanks to a sense control block. PSCr Input A can be the Output of the analog comparator or the
PSCINr input.
As the period of the cycle decreases, the instantaneous frequency of the two outputs increases.
PSCINr
AC1 O: Analog
Comparator
Output
PSCINrA
PSCINrB
PISELrA1
(PISELrB1)
0
0
1
1
PSCR Input Module
0
1
0
1
PISELrA0
(PISELrB0)
PSCR Input A
(PSCR Input B)
PELE V rA /
(PELE V rB )
PRFM rA3:0
(PRFM rB3:0)
PCAErA
(PCAErB)
Digital
Filter
CLK
PSC
PAO CrA
(PA OCrB)
PFLTErA
(PFLTErB)
0
1
CLK
CLK
2
4
PSC
PSC
Input
Processing
(retriggering ...)
PSC C o re
(Counter,
Waveform
Generator, ...)
Output
Control
PSCOUT r0
(PSCOUT r1)
7734M–AVR–03/10
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