16.14 Operating Description Of Noise Filter - Fujitsu F2MC-8FX Hardware Manual

F2mc-8fx 8-bit microcontroller

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CHAPTER 16 8/16-BIT COMPOSITE TIMER

16.14 Operating Description of Noise Filter

This section describes the operations of the noise filter for the 8/16-bit composite timer.

When the input capture or PWC timer function has been selected, a noise filter can be used to eliminate the

pulse noise of the signal from the external input pin (EC00/EC01). H-pulse noise, L-pulse noise, or H/L-

pulse noise elimination can be selected depending on the register setting (TMCR0:F11, F10, F01, F00). The

maximum pulse width from which to eliminate noise is three machine clock cycles. When the filter

function is active, the signal input is subject to a delay of four machine clock cycles.

filter clock

input signal

Output filter

Output filter

Output filter

Figure 16.14-1 Operation of Noise Filter

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