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Enhanced Queued Analog-to-Digital Converter (eQADC)
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
19-15
minimum number of system clocks that must be counted by the digital filter counter to recognize a logic
state change.
Address: Base + 0x000C
Access: R/W
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
0
0
0
0
0
0
0
0
0
0
0
0
DFL
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 19-4. eQADC External Trigger Digital Filter Register (EQADC_ETDFR)
Table 19-5. EQADC_ETDFR Field Description Table
Field
Description
0–27
Reserved.
28–31
DFL[0:3]
Digital filter length. Specifies the minimum number of system clocks that must be counted by the digital filter counter
to recognize a logic state change. The count specifies the sample period of the digital filter which is calculated
according to the following equation:
Minimum clock counts for which an ETRIG signal needs to be stable to be passed through the filter are shown in
. Refer to
Section 19.4.3.4, “External Trigger Event Detection
,” for more information on the digital filter.
Note:
The DFL field must only be written when the MODE
n
of all CFIFOs are configured to disabled.
Table 19-6. Minimum Required Time to Valid ETRIG
DFL[0:3]
Minimum Clock Count
Minimum Time (ns)
(System Clock = 120MHz)
0b0000
2
16.67
0b0001
3
25.00
0b0010
5
41.67
0b0011
9
75.00
0b0100
17
141.67
0b0101
33
275.00
0b0110
65
541.67
0b0111
129
1075.00
0b1000
257
2141.67
0b1001
513
4275.00
0b1010
1025
8541.67
FilterPeriod
S
(
ystemClockPeriod
2
DFL
)
×
1 S
(
ystemClockPeriod
)
+
=
Содержание MPC5566
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