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EN,PMODE,HYSTCTR
INP
INM
bus clock
FILT_PER
Figure 18-4. Sampled, Non-Filtered (# 3A): Sampling point externally driven
In Sampled, Non-Filtered mode, the analog comparator block is powered and active. The
path from analog inputs to COUTA is combinational (unclocked). Windowing Control is
completely bypassed. COUTA is sampled whenever a rising edge is detected on the Filter
Block clock input.
The only difference in operation between Sampled, Non-Filtered (# 3A) and Sampled,
Non-Filtered (# 3B) is in how the clock to the Filter Block is derived. In #3A, the clock to
filter block is externally derived while in #3B, the clock to filter block is internally
derived.
The comparator filter has no other function than sample/hold of the comparator output in
this mode (# 3B).
NXP Semiconductors
INTERNAL BUS
FILT_PER
COS
INV
+
+
Polarity
Select
-
-
CMPO
WINDOW/SAMPLE
Clock
divided
Prescaler
bus
clock
MC9S08SU16 Reference Manual, Rev. 5, 4/2017
Chapter 18 Chip-specific ACMP information
OPE
FILTER_CNT
SE
COUT
WE
0
0x01
1
Window
Filter
Control
Block
1
0
COUTA
CGMUX
SE=1
IER/F
CFR/F
Interrupt
Control
IRQ
COUT
(TO OTHER SOC FUNCTIONS)
0
CMPO to
1
PAD
COS
305
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