
Clock Module
7-8
Freescale Semiconductor
7.2.4
PLL Feedback Divider Register (PFDR)
7.3
Functional Description
This subsection provides a functional description of the clock module.
7.3.1
PLL Dithered and Non-Dithered Operation
The PLL is capable of generating output clocks with a frequency that modulates in a triangular waveform
with a specified percentage frequency deviation and a specified dither modulation frequency. This
modulation of the output clock is called dithered operation. When the PLL operates at a fixed frequency,
Table 7-5. PMDR Field Descriptions
Field
Description
7–0
MODDIV
Dither modulation divider.
Dither Modulation Frequency = Input Frequency / (MODDIV
×
32)
A dither modulation frequency greater than 105 kHz or less than 9.95 kHz is invalid. For example, for a 16 MHz input
frequency, MODDIV may be programmed between 5 (100 kHz) and 50 (10 kHz). Programming MODDIV outside
the specified range results in unpredictable PLL operation.
Note: This field should only be written when dithering mode is disabled (PCR[DITHEN] = 0). Else, unpredictable PLL
operation results.
Address: 0xFC0C_000C (PFDR)
Access: User read/write
7
6
5
4
3
2
1
0
R
MFD
W
Reset:
See Note
See Note
See Note
See Note
See Note
See Note
See Note
See Note
Note: Reset value determined by reset configuration. See
Chapter 9, “Chip Configuration Module (CCM),”
for
more information. For the default reset configuration (RCON negated), the reset value is 0x5A. If RCON
and D1 is asserted at reset, the reset value of PFDR is 0x78.
Figure 7-6. PLL Feedback Divider Register (PFDR)
Table 7-6. PFDR Field Descriptions
Field
Description
7–0
MFD
The MFD bits control the value of the divider in the PLL feedback loop. The value specified by the MFD bits establish
the multiplication factor applied to the reference frequency. See
Section 7.3.3, “PLL Frequency Multiplication Factor
for more details.
0x58 88
0x59 89
0x5A 90
...
0x86 134
0x87 135
Else Reserved
Note: The MFD bits may only be written when the device is in limp mode (MISCCR[LIMP] = 1).
MCF5329 Reference Manual, Rev 3
Содержание MCF5329
Страница 106: ...ColdFire Core 3 32 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 126: ...Enhanced Multiply Accumulate Unit EMAC 4 20 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 148: ...Cache 5 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 154: ...Static RAM SRAM 6 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 184: ...Power Management 8 18 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 204: ...Reset Controller Module 10 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 220: ...System Control Module SCM 11 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 228: ...Crossbar Switch XBS 12 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 268: ...General Purpose I O Module 13 40 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 392: ...SDRAM Controller SDRAMC 18 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 436: ...Fast Ethernet Controller FEC 19 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 564: ...Liquid Crystal Display Controller LCDC 22 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 594: ...FlexCAN 23 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 678: ...Pulse Width Modulation PWM Module 26 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 684: ...Watchdog Timer Module 27 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 692: ...Programmable Interrupt Timers PIT0 PIT3 28 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 704: ...DMA Timers DTIM0 DTIM3 29 12 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 720: ...Queued Serial Peripheral Interface QSPI 30 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 754: ...UART Modules 31 34 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 770: ...I2 C Interface 32 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 790: ...Message Digest Hardware Accelerator MDHA 33 20 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 866: ...Debug Module 36 50 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Страница 902: ...Register Memory Map Quick Reference A 26 Freescale Semiconductor MCF5329 Reference Manual Rev 3...