Motorola MCF5282, MCF5281 user manual Signal Descriptions, Extal, Signal Properties, Name Function

Signal Descriptions

CLKMOD[1:0] RSTOUT STPMD

	LOCK				LOCKS
	DETECT				LOCK
		LOLRE
LOCEN		PLLMODE			TO RESET
					MODULE
	LOSS OF	LOCRE
	CLOCK				LOCS
	DETECT
REFERENCE	PHASE AND	CHARGE
CLOCK	FREQUENCY		FILTER	VCO	RFD[2:0]
	DETECT	PUMP
					SCALED PLL
					CLOCK OUT
PLLSEL
DISCLK		MDF[2:0]
CLKOUT		⎟ MFD			PLL CLOCK
		(4–18)			OUT

Figure 9-2. PLL Block Diagram

9.5Signal Descriptions

The clock module signals are summarized in Table 9-2and a brief description follows. For more detailed information, refer to Chapter 14, “Signal Descriptions.”

Table 9-2. Signal Properties

Name	Function
EXTAL	Oscillator or clock input
XTAL	Oscillator output
CLKOUT	System clock output
CLKMOD[1:0]	Clock mode select inputs
	Reset signal from reset controller
RSTOUT

9.5.1EXTAL

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 MCF5282 User’s Manual MOTOROLA