MC9RS08KA8RM Datasheet, PDF (119/190 Pages) Freescale Semiconductor, Inc – MC9RS08KA8 Features

Chapter 11
Internal Clock Source (RS08ICSOSCV1)
11.1 Introduction
The internal clock source (ICS) module provides clock source choices for the MCU. The module contains
a frequency-locked loop (FLL) as a clock source controllable by an internal reference clock or an external
reference clock. The module can provide FLL clock, internal reference clock, or external reference clock
as a source for the MCU system clock, ICSOUT.
Whichever clock source is chosen, ICSOUT is passed through a bus clock divider (BDIV), which allows
a lower final output clock frequency to be derived. ICSOUT is two times the bus frequency.
Figure 11-1 shows the MC9RS08KA8 series block diagram with the ICS highlighted.
MC9RS08KA8 Series Reference Manual, Rev. 3
Freescale Semiconductor
119