Motorola MPC533 Reference Manual page 280

Figure 8-1 is a functional block diagram of the clock unit.
MODCK[1:3]
EXTCLK
2:1
MUX
System
Low
Power
Control
Back_Up Clock
Oscillator Loss
Detector
XTAL
Main Clock
Oscillator
EXTAL
8-2
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
XFC VDDSYN VSSSYN
SPLL
TBCLK
3:1 MUX
(/4 or /16)
3:1
MUX
/4 or
/256
Figure 8-1. Clock Unit Block Diagram
MPC533 Reference Manual
VCOOUT
2:1 MUX
Lock
GCLK2
Low
Power
Dividers
(1/2N)
Clock
Drivers
Drivers
TMBCLK
Driver
RTC / PIT Clock
and Driver
GCLK1 / GCLK2
System Clock
GCLK1C / GCLK2C
System Clock
to RCPU AND BBC
CLKOUT
ENGCLK
TMBCLK
PITRTCLK
MOTOROLA