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The filter, CR0[FILTER_CNT], can be clocked from an internal or external clock source.
The filter is programmable with respect to the number of samples that must agree before
a change in the output is registered. In the simplest case, only one sample must agree. In
this case, the filter acts as a simple sampler.
The external sample input is enabled using CR1[SE]. When set, the output of the
comparator is sampled only on rising edges of the sample input.
The "windowing mode" is enabled by setting CR1[WE]. When set, the comparator output
is sampled only when WINDOW=1. This feature can be used to ignore the comparator
output during time periods in which the input voltages are not valid. This is especially
useful when implementing zero-crossing-detection for certain PWM applications.
The comparator filter and sampling features can be combined as shown in the following
table. Individual modes are discussed below.
Table 16-1. Comparator sample/filter controls
Mode #
CR1[EN]
CR1[WE]
CR1[SE]
CR0[FILTER_C
NT]
FPR[FILT_PER]
Operation
1
0
X
X
X
X
Disabled
2A
1
0
0
0x00
X
Continuous Mode
.
2B
1
0
0
X
0x00
3A
1
0
1
0x01
X
Sampled, Non-Filtered mode
3B
1
0
0
0x01
> 0x00
4A
1
0
1
> 0x01
X
Sampled, Filtered mode
See the
4B
1
0
0
> 0x01
> 0x00
5A
1
1
0
0x00
X
Windowed mode
Comparator output is sampled on
every rising bus clock edge when
SAMPLE=1 to generate COUTA.
See the
.
5B
1
1
0
X
0x00
6
1
1
0
0x01
0x01–0xFF
Windowed/Resampled mode
Comparator output is sampled on
every rising bus clock edge when
SAMPLE=1 to generate COUTA,
which is then resampled on an
interval determined by FILT_PER to
generate COUT.
.
7
1
1
0
> 0x01
0x01–0xFF
Windowed/Filtered mode
Table continues on the next page...
Chapter 16 Comparator (CMP)
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors
357
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