Motorola MCF5281 用户手册

9-4

MOTOROLA

 

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.”

This input is driven by an external clock except when used as a connection to the external
crystal when using the internal oscillator.

EXTAL

Oscillator or clock input

XTAL

Oscillator output

CLKOUT

System clock output

CLKMOD[1:0]

Clock mode select inputs

RSTOUT

Reset signal from reset controller

STPMD

CLKMOD[1:0]

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