IRQ
INP
INM
FILTER_CNT
INV
COUT
COUT
OPE
SE
CMPO to
PAD
COUTA
1
WE
0
SE
CGMUX
COS
FILT_PER
+
-
FILT_PER
bus clock
COS
IER/F CFR/F
WINDOW/SAMPLE
1
0
EN,PMODE,HYSCTRL[1:0]
Interrupt
control
Filter
block
Window
control
Polarity
select
Clock
prescaler
divided
bus
clock
CMPO
To other SOC functions
Internal bus
Figure 35-2. Comparator module block diagram
In the CMP block diagram:
• The Window Control block is bypassed when CR1[WE] = 0
• If CR1[WE] = 1, the comparator output will be sampled on every bus clock when
WINDOW=1 to generate COUTA. Sampling does NOT occur when WINDOW = 0.
• The Filter block is bypassed when not in use.
• The Filter block acts as a simple sampler if the filter is bypassed and
CR0[FILTER_CNT] is set to 0x01.
• The Filter block filters based on multiple samples when the filter is bypassed and
CR0[FILTER_CNT] is set greater than 0x01.
• If CR1[SE] = 1, the external SAMPLE input is used as sampling clock
• If CR1[SE] = 0, the divided bus clock is used as sampling clock
Chapter 35 Comparator (CMP)
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 821
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