R01UH0823EJ0100 Rev.1.00 Page 707 of 1823
Jul 31, 2019
RX23W Group 25. 16-Bit Timer Pulse Unit (TPUa)
25.3.7 Noise Filters
Each pin for use in input capture by TPU is equipped with a noise filter. The noise filter samples the level on the pin three
times at the selected sampling interval, conveys the level to the internal circuits if the samples match, and continues to
convey that level until the other level is sampled from the pins three times in a row. The noise filter function can be
enabled or disabled for each pin. Furthermore, sampling clock settings can be made for each channel.
Figure 25.30 is a timing chart for the noise filter.
Figure 25.30 Timing Chart for the Noise Filter
Signal conveyed to
internal block
Sampling clock
Input-capture input
(1)
(2) (3)
(1) (2)
The level matched 3
times so is conveyed
internally.
The level only matched twice
so is not conveyed internally.
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