at90pwm81-16se ATMEL Corporation, at90pwm81-16se Datasheet - Page 114

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

114
AT90PWM81
According to PSC n Input A Control Register (see Section “PSC n Input A Control Register – PFRCnA”,
page 140), PSC n input A can act as a Retrigger or Fault input.
Each part A or B can be triggered by up to four signals as defined per
13-19 on page 139
Part A of PSC has also a blanking module allowing to cancel unwanted transitions which may appear on
the PSC n input A during a certain period of time.
The blanking start is defined by the bits PASDLKn(2:0) as per
The blanking duration is defined by the register PASDLYn. If the blanking is selected by the correspond-
ing PASDLKn(2:0) bit, all transitions which may appears from the blanking start until a time period are
ignored.
Blanking is level sensitive, i.e. a pulse started in the blanking window and still at active level after the
window will generate a valid retriggering event.
Figure 13-14. PSC Input Module A
PSC input module B is shown on
According to PSC n Input B Control Register (see Section “PSC n Input B Control Register – PFRCnB”,
page 140), PSC n input B can act as a Retrigger or Fault input.
PSC start c ycle
OCR SB
OSR SA
AC2 O: Analog
Comparator
Output
PSCINnA
AC3 O: Analog
Comparator
Output
PSCINn
PAS DLKn(2:0)
PISELnA1
3
2
1
0
0
1
1
0
1
PISELnA0
0
1
PSC n Input A
PELE VnA /
Blanking S tart
=0, 4..7
No Blanking
Input
Blanking
PAS DLY
Table 13-15
PRFM nA3:0
Digital
Filter
CLK
PCAEnA
PSC
PAO CnA
PFLTEnA
0
1
CLK
4
PSC
Table 13-14 on page
Input
Proces sing
(retriggering ...)
PSC C o re
(Counter,
Wav eform
Generator, ...)
Table 13-18 on page 138
Output
Control
136.
PSCOUT n0
(PSCOUT n1)
(PSCOUT22
(PSCOUT23
7734M–AVR–03/10
and
Table