mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 695

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

The only difference in operation between Sampled, Non-Filtered (# 3B) and Sampled,
Filtered (# 4B) is that CR0[FILTER_CNT] is now greater than 1, which activates filter
operation.
30.8.1.5 Windowed Mode (#s 5A & 5B)
The following figure illustrates comparator operation in the windowed mode, ignoring
latency of the analog comparator, polarity select and Window Control block. It also
assumes that the Polarity Select is set to "non-inverting". Note that the analog comparator
output is passed to COUTA only when the WINDOW signal is high.
In actual operation, COUTA may lag the analog inputs by up to one bus clock cycle plus
the combinational path delay through the comparator and polarity select logic.
Freescale Semiconductor, Inc.
INM
INP
Figure 30-19. Sampled, Filtered (# 4B): Sampling point internally derived
FILT_PER
bus clock
EN, PMODE,HYSTCTR[1:0
MCF51JF128 Reference Manual, Rev. 2, 03/2011
+
+
-
-
Clock
Prescaler
CMPO
FILT_PER
]
WINDOW/SAMPLE
COS
divided
bus
clock
Polarity
Select
INV
Preliminary
INTERNAL BUS
Window
Control
WE
0
SE=0
1
0
FILTER_CNT
CGMUX
>
0x01
Filter
Block
1
SE
COUT
COUTA
OPE
Chapter 30 Comparator (CMP)
(TO OTHER SOC FUNCTIONS))
COUT
IER/F
Interrupt
Control
COS
1
0
CFR/F
CMPO to
PAD
IRQ
695