R01UH0823EJ0100 Rev.1.00 Page 584 of 1823
Jul 31, 2019
RX23W Group 23. Multi-Function Timer Pulse Unit 2 (MTU2a)
23.3.10 Noise Filter
Each pin for use in input capture and external pulse input to the MTU is equipped with a noise filter. The noise filter
samples input signals at the sampling clock and removes the pulses of which length is less than three sampling cycles.
The noise filter functionality includes enabling and disabling of the noise filter for each pin and setting of the sampling
clock for each channel.
Figure 23.77 shows the timing of noise filtering.
Figure 23.77 Timing of Noise Filtering
Sampling clock
Signal conveyed
internally
Matching three times
Noise filter enable/
disable register
Noise filter enabledNoise filter disabled
Eliminated pulse
Input capture input pin or
external pulse input pin
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