
Frequency Modulated Phase Locked Loop and System Clocks (FMPLL)
MPC5566 Microcontroller Reference Manual, Rev. 2
11-10
Freescale Semiconductor
Figure 11-7. Crystal Oscillator Network
In crystal reference mode, the FMPLL can generate a frequency modulated clock or a non-modulated
clock (locked on a single frequency). The modulation rate, modulation depth, output clock divide ratio
(RFD), and whether the FMPLL is modulating or not can be programmed by writing to the FMPLL
registers. Crystal reference is the default clock mode for the 416 pin package. It is not necessary to force
PLLCFG[0:1] to enter this mode.
PLLCFG[2] is tied low to operate in the 8–20 MHz range. Refer to FMPLL_SYNCR[PREDIV].
11.1.4.2
External Reference Mode
This external reference mode functions the same as crystal reference mode except that EXTAL_EXTCLK
is driven by an external clock generator rather than a crystal oscillator. Also, the input frequency range
(F
ref_ext
) in external reference mode is the same as the input frequency reference range (F
ref-crystal
) in the
crystal reference mode; frequency modulation is available. To enter external reference mode, the default
FMPLL configuration must be overridden by following the procedure outlined in
.” A block diagram illustrating external reference mode is shown in
.
V
SSSYN
C2
EXTAL
XTAL
V
SSSYN
C1
Crystal
RF
1
On chip
Oscillator
1
For an 8–20 MHz crystal, the resistor must be 1–2.8 K
Ω
. The exact value depends on the crystal
characteristics, thus consult the crystal manufacturer.
Содержание MPC5566
Страница 12: ...MPC5566 Microcontroller Reference Manual Devices Supported MPC5566 MPC5566 RM Rev 2 0 23 Apr 2008...
Страница 81: ...Introduction MPC5566 Microcontroller Reference Manual Rev 2 1 24 Freescale Semiconductor...
Страница 135: ...Signal Description MPC5566 Microcontroller Reference Manual Rev 2 2 54 Freescale Semiconductor...
Страница 189: ...Reset MPC5566 Microcontroller Reference Manual Rev 2 4 20 Freescale Semiconductor...
Страница 331: ...System Integration Unit SIU MPC5566 Microcontroller Reference Manual Rev 2 6 128 Freescale Semiconductor...
Страница 343: ...Crossbar Switch XBAR MPC5566 Microcontroller Reference Manual Rev 2 7 12 Freescale Semiconductor...
Страница 361: ...Error Correction Status Module ECSM MPC5566 Microcontroller Reference Manual Rev 2 8 18 Freescale Semiconductor...
Страница 455: ...Interrupt Controller INTC MPC5566 Microcontroller Reference Manual Rev 2 10 42 Freescale Semiconductor...
Страница 603: ...Flash Memory MPC5566 Microcontroller Reference Manual Rev 2 13 38 Freescale Semiconductor...
Страница 609: ...SRAM MPC5566 Microcontroller Reference Manual Rev 2 14 6 Freescale Semiconductor...
Страница 679: ...Boot Assist Module BAM MPC5566 Microcontroller Reference Manual Rev 2 16 20 Freescale Semiconductor...
Страница 997: ...Deserial Serial Peripheral Interface DSPI MPC5566 Microcontroller Reference Manual Rev 2 20 72 Freescale Semiconductor...
Страница 1037: ...Enhanced Serial Communication Interface eSCI MPC5566 Microcontroller Reference Manual Rev 2 21 40 Freescale Semiconductor...
Страница 1073: ...MPC5566 Microcontroller Reference Manual Rev 2 22 36 Freescale Semiconductor...
Страница 1081: ...Voltage Regulator Controller VRC and POR Module MPC5566 Microcontroller Reference Manual Rev 2 23 8 Freescale Semiconductor...
Страница 1093: ...IEEE 1149 1 Test Access Port Controller JTAGC MPC5566 Microcontroller Reference Manual Rev 2 24 12 Freescale Semiconductor...
Страница 1185: ...Nexus MPC5566 Microcontroller Reference Manual Rev 2 25 92 Freescale Semiconductor...
Страница 1267: ...MPC5566 Reference Manual Revision History MPC5566 Microcontroller Reference Manual Rev 2 Freescale Semiconductor C 10...
Страница 1268: ...MPC5566 Reference Manual Revision History MPC5566 Microcontroller Reference Manual Rev 2 Freescale Semiconductor C 11...