topic Re: Input capture filter on FlexTimer (KV4x) in Kinetis Microcontrollers

Input capture filter on FlexTimer (KV4x)

guenter_loettrich — Tue, 24 Oct 2017 07:14:44 GMT

Hi all,

a question regarding FTM on Kinetis:

40.4.19 Input Capture Filter Control (FTMx_FILTER)

This register selects the filter value for the inputs of channels.

CHxFVAL

Channel x Input Filter

Selects the filter value for the channel input.

The filter is disabled when the value is zero.

There are 4 bits for the filter values. How is the "effect" of filtering per 1 LSB of those 4 bits?

Does it basically tell how long the input signal have to be minimum (measured in system clock cycles) to go through the filter?

Guenter

Re: Input capture filter on FlexTimer (KV4x)

Robin_Shen — Thu, 26 Oct 2017 06:42:34 GMT

Hi Guenter,

For the chapter of FTM module, here the system clock means the Fast Peripheral clock. We can find it in 'Table 6-1. Module clocks' of KV4XP100M168RM.

For detail about the Filter, please read the '40.5.4.1 Filter for Input Capture mode'.

Best Regards,

Robin

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