MC9S08DZ96F2CLL datasheet(165/458 Pages) FREESCALE

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MC9S08DZ128 Series Data Sheet, Rev. 1

Freescale Semiconductor

165

Chapter 8

Multi-Purpose Clock Generator (S08MCGV2)

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 MC9S08DZ128 Series feature the MCG module.

NOTE

Refer to Section 1.3, “System Clock Distribution,” for detailed view of the

distribution of clock sources throughout the chip.

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