HCS08 datasheet(121/198 Pages) NXP

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HCS08 데이터시트(PDF) 121 Page - NXP Semiconductors

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MC9S08QD4 Series MCU Data Sheet, Rev. 6

Freescale Semiconductor

121

Chapter 9

Internal Clock Source (S08ICSV1)

9.1

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 an internal reference clock. The

module can provide this FLL clock or the internal 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 9-1 Shows the MC9S08QD4 series with the ICS module highlighted.

9.1.1

ICS Configuration Information

Bit-1 and bit-2 of ICS control register 1 (ICSC1) always read as 1.

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