RH850/F1Kx, RH850/F1K Series Hardware Design Guide
R01AN3841ED0110 Rev. 1.10 Page 74 of 108
August 8, 2019
4.3.4 Analog Filter Function
Depending on the alternative port functionality selected, some input signals of the device pins are passed through an
analog filter - respectively analog delay stage - to remove noise and glitches from the input signal.
The detection level of the filtered input signal depends on the high-level/low-level input voltage of the port input buffer
and its supported electrical characteristics.
After passing the external signal through an analog filter to eliminate noise and spikes, the event detection evaluates the
level or any level change, i.e. an edge, of the signal and generates an output accordingly.
Figure 31: Analog filter function
Note: The event detection implementation depends on the analog filter type.
The input detection level as well as the pulse rejection of the analog filters are specified in the corresponding pin
characteristics and peripheral chapters in the electrical characteristics of the RH850/F1KH, RH850/F1KM Hardware
User’s Manual respectively the electrical characteristics of the RH850/F1K Hardware User’s Manual.
Port Input
Buffer
Analog Filter
Pn_m
Event
Detection
Note
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