Information

12.2.1 System Options Register 1 (SIM_SOPT1)
The reset value of the SOPT1 register is as follows: Exit from POR and LVD:
USBREGEN is set, USBSTBY is cleared, and OSC32KSEL is cleared. Exit from VLLS
or other system reset: USBREGEN, USBSTBY and OSC32KSEL are unaffected
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
USBSTBY
Reserved
0 MS 0
OSC32KSEL
0
W
Reset
x* x* x* x* x* x* x* x* x* x* x* x* x* x* x* x*
Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R
RAMSIZE 0
W
Reset
x* x* x* x* x* x* x* x* x* x* x* x* x* x* x* x*
* Notes:
x = Undefined at reset.•
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
USBSTBY
USB voltage regulator in standby mode
Controls whether the USB voltage regulator is placed in standby mode.
0 USB voltage regulator not in standby.
1 USB voltage regulator in standby.
29–27
Reserved
This field is reserved.
26–24
Reserved
This read-only field is reserved and always has the value zero.
23
MS
EzPort chip select pin state
Reflects the state of the EzPort chip select (EZP_CS) pin during the last reset. This bit is read-only.
Table continues on the next page...
Memory map and register definition
K20 Sub-Family Reference Manual, Rev. 6, Nov 2011
260 Freescale Semiconductor, Inc.