MC9S08SH8CSC データシートの表示（PDF） - Freescale Semiconductor

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MC9S08SH8CSC

HCS08 Microcontrollers

Freescale Semiconductor 

Chapter 10

Internal Clock Source (S08ICSV2)

10.1 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 that is controllable by either an internal or an external

reference clock. The module can provide this FLL clock or either of the internal or external reference

clocks as a source for the MCU system clock. There are also signals provided to control a low power

oscillator (XOSC) module to allow the use of an external crystal/resonator as the external reference clock.

Whichever clock source is chosen, it is passed through a reduced bus divider (BDIV) which allows a lower

final output clock frequency to be derived.

The bus frequency will be one-half of the ICSOUT frequency.

10.1.1 Module Configuratio

When the internal reference is enabled in stop mode (IREFSTEN = 1), the voltage regulator must also be

enabled in stop mode by setting the LVDE and LVDSE bits in the SPMSC1 register.

Figure 10-1 shows the MC9S08SH8 block diagram with the ICS highlighted.

MC9S08SH8 MCU Series Data Sheet, Rev. 3

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