Enhanced Queued Analog-to-Digital Converter (eQADC)
MPC5510 Microcontroller Family Reference Manual, Rev. 1
Freescale Semiconductor
31-11
Preliminary
Offset: Base + 0x000C
Access: Read/Write
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 31-4. eQADC External Trigger Digital Filter Register (EQADC_ETDFR)
Table 31-4. EQADC_ETDFR Field Description Table
Field
Description
bits 0–27 Reserved.
DFL
Digital Filter Length. Specifies the minimum number of system clocks that must the digital filter counter must count
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
Note: The DFL field must only be written when the MODEn of all CFIFOs are configured to disabled.
Table 31-5. Minimum Required Time to Valid ETRIG
DFL
Minimum Clock Count
Minimum Time (ns)
(System Clock = 66 MHz)
0b0000
2
30.30
0b0001
3
45.45
0b0010
5
75.76
0b0011
9
136.36
0b0100
17
257.58
0b0101
33
500.00
0b0110
65
984.85
0b0111
129
1954.55
0b1000
257
3893.94
0b1001
513
7772.73
0b1010
1025
15530.30
0b1011
2049
31045.45
0b1100
4097
62075.76
0b1101
8193
124136.36
FilterPeriod
S
(
ystemClockPeriod
2
DFL
)
×
1 S
(
ystemClockPeriod
)
+
=