Frequency Modulated Phase Locked Loop and System Clocks (FMPLL)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
11-33
11.5
Document Revision History
Table 11-11. Changes Between MPC5565RM Revisions 0.1 and 1
In the Features list, changed:
• From: “range from 48MHz to 132MHz “
• To: “range from 48MHz to maximum device frequency”
In Section 11.4.2.6.1, “Alternate/Backup Clock Selection,” made this change:
• From: “Note that when the FMPLL is operated in SCM the system frequency is dependent upon the value in RFD[0:2].”
• To: “Note that when the FMPLL is operated in SCM, writes to FMPLL_SYNCR[RFD] have no effect on clock frequency
Added note to the Section 11.4.3.1, “Programming System Clock Frequency Without Frequency Modulation” section:
“When using crystal reference mode or external reference mode, The PREDIV value must not be set to any value that
causes the phase/frequency detector to go below 4MHz. That is, the crystal or external clock frequency divided by the
PREDIV value must be greater than or equal to 4MHz.”
Changed value of ENGCLK divider factors
• From: 2 to 128
• To: 2 to 126
Modified the LOCK bit to read:
PLL lock status bit. Indicates whether the FMPLL has acquired lock. If the LOCK bit is read when the FMPLL simultaneously
loses lock or acquires lock, the bit does not reflect the current condition of the FMPLL.
If operating in bypass mode, LOCK remains cleared after reset. Refer to the for frequency as defined in the
Data Sheet
for
the lock/unlock range.
0 PLL is unlocked.
1 PLL is locked.
Made changes in LOCKS bit:
• From “a write to the FMPLL_SYNCR which modifies the MFD bits”
• To: a write to the FMPLL_SYNCR which modifies the MFD and PREDIV bits”
In Section 11.4.2.2, “Reduced Frequency Divider (RFD)”:
• From: “The RFD must be programmed to be
≥
1 when changing MFD or PREDIV or when enabling frequency modulation”
• To: “To protect the system from frequency overshoot during the PLL lock detect phase, the RFD must be programmed to
be
≥
1 when changing MFD or PREDIV or when enabling frequency modulation.”
Added the symbols F
ref_crystal
and F
ref_ext
to the diagrams, and throughout the manual added further explanation of the fact
that F
prediv
is the frequency after the predivider.
Modified Table 11-7 “Input Clock Frequency” by adding a column of frequency symbols.
Modified Table 11-9 “Clock Out vs Clock In Relationships” by changing F
ref
symbols to F
ref_crystal
and F
ref_ext
.
Changed the range 16 -40 MHz to simply 40 MHz.
Modified the crystal oscillator network figure to show resistor on the XTAL signal.
Section Table 11-5., “FMPLL_SYNSR Field Descriptions: for the LOCK bit description, added: If operating in bypass mode,
LOCK remains cleared after reset. Refer to the frequency as defined in the
MPC5565 Microcontroller Data Sheet
for the
lock/unlock range.
Содержание MPC5565
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Страница 895: ...Deserial Serial Peripheral Interface DSPI MPC5565 Microcontroller Reference Manual Rev 1 0 19 72 Freescale Semiconductor...
Страница 973: ...Preface MPC5565 Microcontroller Reference Manual Rev 1 0 21 36 Freescale Semiconductor...
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