Freescale Semiconductor MCF5329, Reference Manual, Page: 157 / 924

Clock Module
Freescale Semiconductor 7-3
7.1.1 Block Diagram
Figure 7-2 shows a block diagram of the clock module.
Figure 7-2. Clock Module Diagram
7.1.2 Features
Features of the clock module include the following:
• 16-MHz reference crystal oscillator
• Voltage controlled oscillator range from 350 MHz to 540 MHz, resulting in a core frequency
(f
vco
÷
2) of 175 MHz to 240 MHz (maximum rated for device)
• Programmable dithering
• Support for low-power modes
• Direct clocking of system by input clock, bypassing the PLL
• Loss-of-lock reset
• 32/32.768-kHz reference crystal oscillator for the real time clock (RTC) module. Input clock used
is programmable within the RTC.
7.1.3 Modes of Operation
The PLL operational mode must be configured during reset. The reset configuration pins must be driven
to the appropriate state for the desired mode from the time RSTOUT asserts until it negates. Refer to
Chapter 9, “Chip Configuration Module (CCM).”
Divide-by-4
Feedback Divider
(MFD)
Phase/Frequency
Detector (PFD)
Loop Filter
Voltage-Controlled
Oscillator (VCO)
Output Dividers
Output Clocks
Modulator
Divider/Counter
Bus
Interface
VCO Clock
Frequency
Reset Config
Signals
PLL
Registers
OSC
XTAL
EXTAL
OSC
XTAL32K
EXTAL32K
Clock to RTC Module
MCF5329 Reference Manual, Rev 3