MC9S08DN60 Datasheet, PDF (127/354 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 8
Multi-Purpose Clock Generator (S08MCGV1)
8.1 Introduction
The multi-purpose clock generator (MCG) module provides several clock source choices for the MCU.
The module contains a frequency-locked loop (FLL) and a phase-locked loop (PLL) that are controllable
by either an internal or an external reference clock. The module can select either of the FLL or PLL clocks,
or either of the internal or external reference clocks as a source for the MCU system clock. Whichever
clock source is chosen, it is passed through a reduced bus divider which allows a lower output clock
frequency to be derived. The MCG also controls an external oscillator (XOSC) for the use of a crystal or
resonator as the external reference clock.
All devices in the MC9S08DN60 Series feature the MCG module.
NOTE
Refer to Section 1.3, “System Clock Distribution,” for detailed view of the
distribution clock sources throughout the chip.
MC9S08DN60 Series Data Sheet, Rev 2
Freescale Semiconductor
127