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MC9S08GB32CB Datasheet(PDF) 10 Page - Freescale Semiconductor, Inc |
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MC9S08GB32CB Datasheet(HTML) 10 Page - Freescale Semiconductor, Inc |
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10 / 290 page  MC9S08GB/GT Data Sheet, Rev. 2.3 10 Freescale Semiconductor Section Number Title Page Chapter 7 Internal Clock Generator (ICG) Module 7.1 Introduction .....................................................................................................................................99 7.1.1 Features ..........................................................................................................................100 7.1.2 Modes of Operation .......................................................................................................101 7.2 External Signal Description ..........................................................................................................101 7.2.1 Overview ........................................................................................................................101 7.2.2 Detailed Signal Descriptions .........................................................................................102 7.2.2.1 EXTAL— External Reference Clock / Oscillator Input ...............................102 7.2.2.2 XTAL— Oscillator Output ...........................................................................102 7.2.3 External Clock Connections ..........................................................................................102 7.2.4 External Crystal/Resonator Connections .......................................................................102 7.3 Functional Description ..................................................................................................................103 7.3.1 Off Mode (Off) ..............................................................................................................103 7.3.1.1 BDM Active .................................................................................................103 7.3.1.2 OSCSTEN Bit Set .........................................................................................103 7.3.1.3 Stop/Off Mode Recovery ..............................................................................104 7.3.2 Self-Clocked Mode (SCM) ............................................................................................104 7.3.3 FLL Engaged, Internal Clock (FEI) Mode ....................................................................105 7.3.3.1 FLL Engaged Internal Unlocked ..................................................................105 7.3.3.2 FLL Engaged Internal Locked ......................................................................106 7.3.4 FLL Bypassed, External Clock (FBE) Mode ................................................................106 7.3.5 FLL Engaged, External Clock (FEE) Mode ..................................................................106 7.3.5.1 FLL Engaged External Unlocked .................................................................106 7.3.5.2 FLL Engaged External Locked .....................................................................107 7.3.6 FLL Lock and Loss-of-Lock Detection .........................................................................107 7.3.7 FLL Loss-of-Clock Detection ........................................................................................107 7.3.8 Clock Mode Requirements ............................................................................................108 7.3.9 Fixed Frequency Clock ..................................................................................................109 7.4 Initialization/Application Information ..........................................................................................110 7.4.1 Introduction ....................................................................................................................110 7.4.2 Example #1: External Crystal = 32 kHz, Bus Frequency = 4.19 MHz .........................112 7.4.3 Example #2: External Crystal = 4 MHz, Bus Frequency = 20 MHz ............................113 7.4.4 Example #3: No External Crystal Connection, 5.4 MHz Bus Frequency .....................114 7.4.5 Example #4: Internal Clock Generator Trim .................................................................116 7.5 ICG Registers and Control Bits .....................................................................................................117 7.5.1 ICG Control Register 1 (ICGC1) ......................................................................118 7.5.2 ICG Control Register 2 (ICGC2) ......................................................................119 7.5.3 ICG Status Register 1 (ICGS1) .................................................................................120 7.5.4 ICG Status Register 2 (ICGS2) ........................................................................122 7.5.5 ICG Filter Registers (ICGFLTU, ICGFLTL) .......................................................122 7.5.6 ICG Trim Register (ICGTRM) ...........................................................................123 |
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