Information

12.2 Memory map and register definition
The SIM module contains many bitfields for selecting the clock source and dividers for
various module clocks. See the Clock Distribution chapter for more information
including block diagrams and clock definitions.
NOTE
The SIM_SOPT1 and SIM_SOPT1CFG registers are located at
a different base address than the other SIM registers.
SIM memory map
Absolute
address
(hex)
Register name
Width
(in bits)
Access Reset value
Section/
page
4004_7000 System Options Register 1 (SIM_SOPT1) 32 R/W See section 12.2.1/223
4004_7004 SOPT1 Configuration Register (SIM_SOPT1CFG) 32 R/W 0000_0000h 12.2.2/225
4004_8004 System Options Register 2 (SIM_SOPT2) 32 R/W 0000_1000h 12.2.3/226
4004_800C System Options Register 4 (SIM_SOPT4) 32 R/W 0000_0000h 12.2.4/229
4004_8010 System Options Register 5 (SIM_SOPT5) 32 R/W 0000_0000h 12.2.5/232
4004_8018 System Options Register 7 (SIM_SOPT7) 32 R/W 0000_0000h 12.2.6/234
4004_8024 System Device Identification Register (SIM_SDID) 32 R Undefined 12.2.7/235
4004_8034 System Clock Gating Control Register 4 (SIM_SCGC4) 32 R/W F010_0030h 12.2.8/237
4004_8038 System Clock Gating Control Register 5 (SIM_SCGC5) 32 R/W 0004_0182h 12.2.9/239
4004_803C System Clock Gating Control Register 6 (SIM_SCGC6) 32 R/W 4000_0001h
12.2.10/
241
4004_8040 System Clock Gating Control Register 7 (SIM_SCGC7) 32 R/W 0000_0002h
12.2.11/
243
4004_8044 System Clock Divider Register 1 (SIM_CLKDIV1) 32 R/W See section
12.2.12/
244
4004_8048 System Clock Divider Register 2 (SIM_CLKDIV2) 32 R/W 0000_0000h
12.2.13/
246
4004_804C Flash Configuration Register 1 (SIM_FCFG1) 32 R See section
12.2.14/
247
4004_8050 Flash Configuration Register 2 (SIM_FCFG2) 32 R See section
12.2.15/
249
4004_8054 Unique Identification Register High (SIM_UIDH) 32 R See section
12.2.16/
250
4004_8058 Unique Identification Register Mid-High (SIM_UIDMH) 32 R See section
12.2.17/
250
Table continues on the next page...
Memory map and register definition
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
222 Freescale Semiconductor, Inc.