mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 21

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

Section Number
20.4
20.5
Freescale Semiconductor, Inc.
20.3.3
20.3.4
20.3.5
20.3.6
20.3.7
20.3.8
20.3.9
20.3.10 MCG Auto Trim Compare Value Low Register (MCG_ATCVL)................................................................445
Functional Description..................................................................................................................................................446
20.4.1
20.4.2
20.4.3
20.4.4
20.4.5
20.4.6
20.4.7
20.4.8
Initialization / Application Information........................................................................................................................454
20.5.1
20.5.2
20.5.3
MCG Control 3 Register (MCG_C3).............................................................................................................438
MCG Control 4 Register (MCG_C4).............................................................................................................439
MCG Control 5 Register (MCG_C5).............................................................................................................440
MCG Control 6 Register (MCG_C6).............................................................................................................441
MCG Status Register (MCG_S)....................................................................................................................443
MCG Auto Trim Control Register (MCG_ATC)..........................................................................................444
MCG Auto Trim Compare Value High Register (MCG_ATCVH)..............................................................445
MCG Mode State Diagram............................................................................................................................446
20.4.1.1
20.4.1.2
Low Power Bit Usage....................................................................................................................................451
MCG Internal Reference Clocks....................................................................................................................451
20.4.3.1
External Reference Clock..............................................................................................................................452
MCG Fixed Frequency Clock .......................................................................................................................452
MCG Background Debug Controller Clock..................................................................................................452
MCG PLL Clock ...........................................................................................................................................453
MCG Auto TRIM (ATM)..............................................................................................................................453
MCG Module Initialization Sequence...........................................................................................................454
20.5.1.1
Using a 32.768 kHz Reference......................................................................................................................456
MCG Mode Switching...................................................................................................................................457
20.5.3.1
20.5.3.2
20.5.3.3
MCG Modes of Operation.........................................................................................................447
MCG Mode Switching...............................................................................................................450
MCG Internal Reference Clock.................................................................................................451
Initializing the MCG..................................................................................................................454
Example 1: Moving from FEI to PEE Mode: External Crystal = 4 MHz, MCGOUT
Frequency = 48 MHz.................................................................................................................458
Example 2: Moving from PEE to BLPI Mode: MCGOUT Frequency =32 kHz......................462
Example 3: Moving from BLPI to FEE Mode...........................................................................464
MCF51JF128 Reference Manual, Rev. 2, 03/2011
Preliminary
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