Clock Module
MCF52235 ColdFire® Integrated Microcontroller Reference Manual, Rev. 6
7-4
Freescale Semiconductor
Figure 7-2. PLL Block Diagram
7.6
Signal Descriptions
The clock module signals are summarized in
and a brief description follows. For more detailed
information, refer to
Chapter 2, “Signal Descriptions.”
7.6.1
EXTAL
This input is driven by an external clock except when used as a connection to the external crystal when
using the internal oscillator.
Table 7-2. Signal Properties
Name
Function
EXTAL
Oscillator or clock input
XTAL
Oscillator output
CLKOUT
System clock output
RSTO
Reset signal from reset controller
STPMD
RSTOUT
÷
MFD
(4–18)
LOCKS
LOCK
LOCS
TO RESET
MODULE
CLKOUT
PLLSEL
DISCLK
MDF[2:0]
PHASE AND
FREQUENCY
DETECT
LOSS OF
CLOCK
DETECT
LOCK
DETECT
CHARGE
PUMP
FILTER
VCO
RFD[2:0]
SCALED PLL
CLOCK OUT
PLL CLOCK
OUT
REFERENCE
CLOCK
LOCEN
LOLRE
PLLMODE
LOCRE
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:MCF52234CVM60,
MCF52235CVM60
