Information

SIM memory map (continued)
Absolute
address
(hex)
Register name
Width
(in bits)
Access Reset value
Section/
page
4004_805C Unique Identification Register Mid Low (SIM_UIDML) 32 R See section
12.2.18/
251
4004_8060 Unique Identification Register Low (SIM_UIDL) 32 R See section
12.2.19/
251
12.2.1 System Options Register 1 (SIM_SOPT1)
NOTE
The SOPT1 register is only reset on POR or LVD.
Address: SIM_SOPT1 is 4004_7000h base + 0h offset = 4004_7000h
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
R
USBREGEN
USBSSTBY USBVSTBY
0
OSC32KSEL
0
W
Reset
1* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0*
Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R
RAMSIZE 0
Reserved
W
Reset
0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0*
* Notes:
Reset value loaded during System Reset from Flash IFR.•
SIM_SOPT1 field descriptions
Field Description
31
USBREGEN
USB voltage regulator enable
Controls whether the USB voltage regulator is enabled.
0 USB voltage regulator is disabled.
1 USB voltage regulator is enabled.
30
USBSSTBY
USB voltage regulator in standby mode during Stop, VLPS, LLS and VLLS modes.
Controls whether the USB voltage regulator is placed in standby mode during Stop, VLPS, LLS and VLLS
modes.
Table continues on the next page...
Chapter 12 System Integration Module (SIM)
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 223