35.3.1.7 Windowed/Filtered mode (#7)
This is the most complex mode of operation for the comparator block, as it uses both
windowing and filtering features. It also has the highest latency of any of the modes. This
can be approximated: up to 1 bus clock synchronization in the window function +
((CR0[FILTER_CNT] * FPR[FILT_PER]) + 1) * bus clock for the filter function.
When any windowed mode is active, COUTA is clocked by the bus clock whenever
WINDOW = 1. The last latched value is held when WINDOW = 0.
+
-
IRQ
EN, PMODE,HYSCTR[1:0]
INP
INM
FILTER_CNT
INV
COUT
COUT
OPE
SE
CMPO to
PAD
COUTA
0
1
WE
1
0
SE=0
CGMUX
COS
FILT_PER
01
FILT_PER
bus clock
COS
>
IER/F
CFR/F
WINDOW/SAMPLE
Polarity
select
Window
control
Filter
block
Interrupt
control
divided
bus
clock
Clock
prescaler
CMPO
0x01
To other SOC functions
Internal bus
Figure 35-11. Windowed/Filtered mode
35.3.2
Power modes
35.3.2.1 Wait mode operation
During Wait and VLPW modes, the CMP, if enabled, continues to operate normally and
a CMP interrupt can wake the MCU.
Chapter 35 Comparator (CMP)
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 837
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