Information

24.1.2 Modes of Operation
There are nine modes of operation for the MCG: FEI, FEE, FBI, FBE, PBE, PEE, BLPI,
BLPE, and Stop. For details, see MCG modes of operation.
24.2 External Signal Description
There are no MCG signals that connect off chip.
24.3 Memory Map/Register Definition
This section includes the memory map and register definition.
The MCG registers can only be written to when in supervisor mode. Write accesses when
in user mode will result in a bus error. Read accesses may be performed in both
supervisor and user modes.
MCG memory map
Absolute
address
(hex)
Register name
Width
(in bits)
Access Reset value
Section/
page
4006_4000 MCG Control 1 Register (MCG_C1) 8 R/W 04h 24.3.1/434
4006_4001 MCG Control 2 Register (MCG_C2) 8 R/W 80h 24.3.2/435
4006_4002 MCG Control 3 Register (MCG_C3) 8 R/W Undefined 24.3.3/436
4006_4003 MCG Control 4 Register (MCG_C4) 8 R/W Undefined 24.3.4/437
4006_4004 MCG Control 5 Register (MCG_C5) 8 R/W 00h 24.3.5/438
4006_4005 MCG Control 6 Register (MCG_C6) 8 R/W 00h 24.3.6/439
4006_4006 MCG Status Register (MCG_S) 8 R 10h 24.3.7/441
4006_4008 MCG Status and Control Register (MCG_SC) 8 R/W 02h 24.3.8/442
4006_400A
MCG Auto Trim Compare Value High Register
(MCG_ATCVH)
8 R/W 00h 24.3.9/444
4006_400B
MCG Auto Trim Compare Value Low Register
(MCG_ATCVL)
8 R/W 00h
24.3.10/
444
4006_400C MCG Control 7 Register (MCG_C7) 8 R/W 00h
24.3.11/
444
4006_400D MCG Control 8 Register (MCG_C8) 8 R/W 80h
24.3.12/
445
Chapter 24 Multipurpose Clock Generator (MCG)
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 433