Fujitsu 8FX User Manual

MB95630H Series
158 FUJITSU SEMICONDUCTOR LIMITED MN702-00009-2v0-E
CHAPTER 11 8/16-BIT COMPOSITE TIMER
11.13 Operation of Noise Filter
11.13 Operation of Noise Filter
This section describes the operation of the noise filter of the 8/16-bit composite
timer.
When the input capture function or PWC timer function is selected, a noise filter can be used to
eliminate the pulse noise of the signal from the external input pin (ECn). H-pulse noise, L-
pulse noise, or H/L-pulse noise elimination can be selected by the FE11, FE10, FE01 and FE00
bits in the TMCRn register. The maximum pulse width that can be eliminated is three machine
clock cycles. If the noise filter function is activated, the signal input will be delayed for four
machine clock cycles.
Figure 11.13-1 Operation of Noise Filter
Sampling
filter clock
External
input signal
Output filter
"H" noise
Output filter
"L" noise
Output filter
"H"/"L" noise

Fujitsu 8FX Specifications

General

Brand	Fujitsu
Model	8FX
Category	Computer Hardware
Language	English