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Chapter 6 Clock Description
MPC5606BK Microcontroller Reference Manual, Rev. 2
128
Freescale Semiconductor
6.8.5.2
Frequency Display Register (CMU_FDR)
.
6.8.5.3
High Frequency Reference Register FMPLL (CMU_HFREFR)
Offset: 0x04
Access: Read-only
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
FD[19:16]
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
FD[15:0]
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 6-13. Frequency Display Register (CMU_FDR)
Table 6-18. CMU_FDR field descriptions
Field
Description
FD
Measured frequency bits.
This register shows the measured frequency f
x
with respect to f
FXOSC
. The measured value is given
by the following formula: f
x
= (f
FXOSC
× MD) / n, where n is the value in CMU_FDR register.
Note:
x = FIRC, SIRC or SXOSC.
Offset: 0x08
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
HFREF
W
Reset
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
Figure 6-14. High Frequency Reference Register FMPLL (CMU_HFREFR)
Table 6-19. CMU_HFREFR field descriptions
Field
Description
HFREF
High Frequency reference value.
This field determines the high reference value for the FMPLL clock. The reference value is given by:
(HFREF
16) × (f
FIRC
4).
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