tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 177
tmp89fm42
Manufacturer Part Number
tmp89fm42
Description
8 Bit Microcontroller
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP89FM42.pdf
(408 pages)
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RA001
13.5 Noise Canceller
13.5.1 Setting
The digital noise canceller can be used in the operation modes that use the TCA0 pin.
TA0CR<TA0NC>. When the same level is detected three times consecutively, the level of the input to the
timer is changed.
the TA0CR<TA0S> value.
sampling interval after TA0CR<TA0NC> is set has elapsed. This stabilizes the input signal.
writing is ignored.
operation. Setting TA0CR<TA0NC> to "00" disables the noise canceller. Setting TA0CR<TA0NC> to "01" or
"10" disables the TCA0 pin input.
When the digital noise canceller is used, the input level is sampled at the sampling intervals set at
Setting TA0CR<TA0NC> to any values than "00" allows the noise canceller to start operation, regardless of
When the noise canceller is used, allow the timer to start after a period of time that is equal to four times the
Set TA0CR<TA0NC> while the timer is stopped (TA0CR<TA0S> = "0"). When TA0CR<TA0S> is "1",
In the SLOW 1/2 or SLEEP 1 mode, setting TA0CR<TA0NC> to "11" selects fs/2 as the source clock for the
Table 13-4 Noise Cancel Time ( fcgck = 10 [MHz] )
TA0NC
00
01
10
11
25.6 Ps (256/fcgck)
Sampling interval
200 ns (2/fcgck)
400 ns (4/fcgck)
None
Page 163
Time removed as noise
76.8 Ps or less
600 ns or less
1.2 Ps or less
-
Time regarded as signal
102.4 Ps or more
800 ns or more
1.6 Ps or more
-
TMP89FM42
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