Information

Table 32-22. Comparator sample/filter controls (continued)
Mode # CR1[EN] CR1[WE] CR1[SE]
CR0[FILTER_C
NT]
FPR[FILT_PER] Operation
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.
See the Windowed/Resampled
mode (# 6).
7 1 1 0 > 0x01 0x01–0xFF Windowed/Filtered mode
Comparator output is sampled on
every rising bus clock edge when
SAMPLE=1 to generate COUTA,
which is then resampled and filtered
to generate COUT.
See the Windowed/Filtered mode
(#7).
All other combinations of CR1[EN], CR1[WE], CR1[SE], CR0[FILTER_CNT], and FPR[FILT_PER] are illegal.
For cases where a comparator is used to drive a fault input, for example, for a motor-
control module such as FTM, it must be configured to operate in Continuous mode so
that an external fault can immediately pass through the comparator to the target fault
circuitry.
Note
Filtering and sampling settings must be changed only after
setting CR1[SE]=0 and CR0[FILTER_CNT]=0x00. This resets
the filter to a known state.
32.8.1.1 Disabled mode (# 1)
In Disabled mode, the analog comparator is non-functional and consumes no power.
CMPO is 0 in this mode.
CMP functional description
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
646 Freescale Semiconductor, Inc.