AMS42-LAN16fx
Seite 8
3.6.3
Counters with Pulse Time Measurement
The AMS42-LAN16fx features three 32-bit counters allowing the connection of incremental encoders.
The counter inputs (A, B, and Reset) can be assigned to any digital lines of the two digital ports (confi-
gure by software).
The AMS42-LAN16fx counts the number of incoming pulses (max. 16MHz) sampled at the connec-
tion of signal A. If the maximum counting range is reached, the counter will be reset to the minimum
value of the counting range. If the external counter reset is connected, the counter can be reset at any
time.
In comparison to a counter, the quadrature decoder used to connect an incremental encoder consi-
ders the counting direction by decoding a second phase-shifted signal.
To activate the counting function, the respective digital lines of the AMS42-LAN16fx must be assigned
to the counter via software.
Function
Description
max. Pulse Frequ. Connection
Dig. Pins Used Counting Range
Counter
Count
á
16MHz
Signal A
1
0..2
32
-1
Up/Down-counter
Count
áâ
16MHz
Signal A, Signal B 2
-2
31
.. 2
31
-1
Inkremental
encoder
Count
áâ
16MHz
Signal A, Signal B 2
-2
31
.. 2
31
-1
Pulse time
measurement
measure time
betw. 2 edges
temporal
resolution
16,67ns
16MHz
Signal A
1
0 - 71,58s
Please refer to the relevant documentation of your product for further information about connecting your incremental
encoder.
Via Paolo Uccello 4 - 20148 Milano
Tel +39 02 48 009 757 Fax +39 02 48 002 070 [email protected] www.dspmindustria.it
