NXP Semiconductors KL25 Series - Page 16

Section number Title Page
24.4.3 MCG Internal Reference Clocks..................................................................................................................388
24.4.4 External Reference Clock............................................................................................................................389
24.4.5 MCG Fixed frequency clock .......................................................................................................................389
24.4.6 MCG PLL clock ..........................................................................................................................................390
24.4.7 MCG Auto TRIM (ATM)............................................................................................................................390
24.5 Initialization / Application information........................................................................................................................391
24.5.1 MCG module initialization sequence...........................................................................................................391
24.5.2 Using a 32.768 kHz reference......................................................................................................................393
24.5.3 MCG mode switching..................................................................................................................................394
Chapter 25
Oscillator (OSC)
25.1 Introduction...................................................................................................................................................................405
25.2 Features and Modes......................................................................................................................................................405
25.3 Block Diagram..............................................................................................................................................................406
25.4 OSC Signal Descriptions..............................................................................................................................................406
25.5 External Crystal / Resonator Connections....................................................................................................................407
25.6 External Clock Connections.........................................................................................................................................408
25.7 Memory Map/Register Definitions...............................................................................................................................409
25.7.1 OSC Memory Map/Register Definition.......................................................................................................409
25.8 Functional Description..................................................................................................................................................410
25.8.1 OSC Module States......................................................................................................................................410
25.8.2 OSC Module Modes.....................................................................................................................................412
25.8.3 Counter.........................................................................................................................................................413
25.8.4 Reference Clock Pin Requirements.............................................................................................................413
25.9 Reset..............................................................................................................................................................................414
25.10 Low Power Modes Operation.......................................................................................................................................414
25.11 Interrupts.......................................................................................................................................................................414
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
16 Freescale Semiconductor, Inc.