atmega32c1 ATMEL Corporation, atmega32c1 Datasheet - Page 144

• Manufacturer Part Number: atmega32c1
• Description: Atmega32m1 Automotive 8-bit Avr Microcontroller With 32k/64k Bytes In-system Programmable Flash
• Manufacturer: ATMEL Corporation

14.9
14.9.1
14.9.1.1
144
PSC Input
ATmega32/64/M1/C1
PSC Input Configuration
Filter Enable
For detailed information on the PSC, please refer to Application Note ‘AVR138: PSC Cookbook’,
available on the Atmel web site.
Each module 0, 1 and 2 of PSC has its own system to take into account one PSC input. Accord-
ing to PSC Module n Input Control Register
PMICn” on page
Each block A or B is also configured by this PSC Module n Input Control Register (PMICn).
Figure 14-10. PSC Input Module
The PSC Input Configuration is done by programming bits in configuration registers.
If the “Filter Enable” bit is set, a digital filter of 4 cycles is inserted before evaluation of the signal.
The disable of this function is mainly needed for prescaled PSC clock sources, where the noise
cancellation gives too high latency.
Important: If the digital filter is active, the level sensitivity is true also with a disturbed PSC clock
to deactivate the outputs (emergency protection of external component). Likewise when used as
fault input, PSC Module n Input A or Input B have to go through PSC to act on PSCOUTn0/1/2
outputs. This way needs that CLK
trol bit (PAOCnA/B), PSCINn input can desactivate directly the PSC outputs. Notice that in this
case, input is still taken into account as usually by Input Module System as soon as CLK
running.
PSCINn
Analog
Comparator
n Output
PISELnA
(PISELnB)
0
1
PELEVnA /
(PELEVnB)
154.), PSCINn input can act has a Retrigger or Fault input.
PRFMnA3:0
(PRFMnB3:0)
PCAEnA
(PCAEnB)
Digital
Filter
CLK
PSC
PAOCnA
(PAOCnB)
PFLTEnA
(PFLTEnB)
PSC
0
1
CLK
CLK
2
4
PSC
PSC
is running. So thanks to PSC Asynchronous Output Con-
Input
Processing
(retriggering ...)
MPSC Core
(Counter,
Waveform
Generator, ...)
(See “PSC Module n Input Control Register –
Control
of the
6 outputs
PSCOUTnA
PSCOUTnB
7647A–AVR–02/08
PSC
is