Signal Descriptions; Extal; Pll Block Diagram; Signal Properties - Motorola ColdFire MCF5281 User Manual

Signal Descriptions

LOCEN
REFERENCE
CLOCK
PLLSEL
DISCLK
CLKOUT
9.5 Signal Descriptions
The clock module signals are summarized in Table 9-2 and a brief description follows. For
more detailed information, refer to Chapter 14, "Signal Descriptions."

EXTAL

XTAL
CLKOUT
CLKMOD[1:0]
RSTOUT
9.5.1 EXTAL
This input is driven by an external clock except when used as a connection to the external
crystal when using the internal oscillator.
9-4
CLKMOD[1:0]
LOCK
DETECT
PLLMODE
LOSS OF
CLOCK
DETECT
PHASE AND
CHARGE
FREQUENCY
PUMP
DETECT
MDF[2:0]
÷ MFD
(4–18)
Figure 9-2. PLL Block Diagram
Table 9-2. Signal Properties
Name
Oscillator or clock input
Oscillator output
System clock output
Clock mode select inputs
Reset signal from reset controller
MCF5282 User's Manual
RSTOUT
STPMD
LOLRE
LOCRE
FILTER
Function
LOCKS
LOCK
TO RESET
MODULE
LOCS
VCO
RFD[2:0]
SCALED PLL
CLOCK OUT
PLL CLOCK
OUT
MOTOROLA