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Frequency Modulated Phase Locked Loop and System Clocks (FMPLL)
MPC5566 Microcontroller Reference Manual, Rev. 2
11-16
Freescale Semiconductor
11.3.1.2
Synthesizer Status Register (FMPLL_SYNSR)
The synthesizer status register (FMPLL_SYNSR) is a 32-bit register. Only the LOLF and LOCF flag bits
are writable in this register. Writes to bits other than the LOLF and LOCF have no effect.
20–21
DEPTH
[0:1]
Controls the frequency modulation depth and enables the frequency modulation. When programmed to a
value other than 0x0, the frequency modulation is automatically enabled. The programmable frequency
deviations from the system frequency are shown below. If the depth is changed to a value other than 0x0,
the calibration sequence is reinitialized.
Note:
To prevent unintentional interrupt requests, clear LOLIRQ before changing DEPTH.
22–31
EXP
[0:9]
Expected difference value. Holds the expected value of the difference of the reference and the feedback
counters. Refer to
Section 11.4.3.3, “FM Calibration Routine
” to determine the value of these bits. This field
is written by the application before entering calibration mode.
Address: Base + 0x0004
Access: User 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
LOLF
LOC MODE
PLL
SEL
PLL
REF
LOCKS LOCK
LOCF CALD
ONE
CAL
PASS
W
w1c
w1c
Reset
0
0
0
0
0
0
0
0
0
0
0
1
Reset state determined during reset configuration. (Refer to
Section 11.1.4, “FMPLL Modes of Operation
,” for more
information.)
2
Reset state determined during reset.
Note:
“w1c” signifies that this bit is cleared by writing a 1 to it.
Figure 11-9. Synthesizer Status Register (FMPLL_SYNSR)
Table 11-4. FMPLL_SYNCR Field Descriptions (continued)
Field
Description
DEPTH[1]
DEPTH[0]
Modulation Depth (% of Fsys)
0
0
0
0
1
1.0
±
0.2
1
0
2.0
±
0.2
1
1
Reserved
Содержание MPC5566
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