4. Functions
60
CNT-3208M-PE
Abnormal input error
When both of the phase-A and phase-B counter input signals change in level, it is reported as an
abnormal input error in the form of a status report (latch/clear), interrupt, or external output (one-shot
pulse). If phases-A and B change in level simultaneously during a digital filter source clock cycle when
the digital filter has been set, it is reported as an abnormal input error. If phases-A and B change in level
simultaneously during this product reference clock cycle of 40 MHz (25 nsec) with no filter set, it is
also reported as an abnormal input error.
A possible cause of the abnormal input error is as follows.
-
When the phase difference between phases-A and B is shorter than one digital filter source clock
cycle (25 nsec with no filter set)
-
Noise is generated.
Figure 4.17. Abnormal input error
Phase-A input
Phase-B input
An abnormal input error is reported if phases-A and B
change in level during the filter source clock cycle.
No abnormal input error is reported when
the phase difference is longer than the
filter source clock cycle.
Filter source clock
Phase-A input
Phase-B input
Summary of Contents for CNT-3208M-PE
Page 7: ...vi CNT 3208M PE ...
Page 15: ...1 Before Using the Product 8 CNT 3208M PE ...
Page 30: ...2 Setup CNT 3208M PE 23 3 Click on the End button to finish condition setting Click on End ...
Page 35: ...2 Setup 28 CNT 3208M PE ...
Page 71: ...4 Functions 64 CNT 3208M PE ...
