Information

SIM_SOPT1 field descriptions (continued)
Field Description
0 USB voltage regulator not in standby during Stop, VLPS, LLS and VLLS modes.
1 USB voltage regulator in standby during Stop, VLPS, LLS and VLLS modes.
29
USBVSTBY
USB voltage regulator in standby mode during VLPR and VLPW modes
Controls whether the USB voltage regulator is placed in standby mode during VLPR and VLPW modes.
0 USB voltage regulator not in standby during VLPR and VLPW modes.
1 USB voltage regulator in standby during VLPR and VLPW modes.
28–20
Reserved
This read-only field is reserved and always has the value zero.
19–18
OSC32KSEL
32K oscillator clock select
Selects the 32 kHz clock source (ERCLK32K) for TSI and LPTMR. This bit is reset only for POR/LVD.
00 System oscillator (OSC32KCLK)
01 Reserved
10 RTC 32.768kHz oscillator
11 LPO 1 kHz
17–16
Reserved
This read-only field is reserved and always has the value zero.
15–12
RAMSIZE
RAM size
This field specifies the amount of system RAM available on the device.
0000 Undefined
0001 8 KBytes
0010 Undefined
0011 16 KBytes
0100 Undefined
0101 Undefined
0110 Undefined
0111 Undefined
1000 Undefined
1001 Undefined
1010 Undefined
1011 Undefined
1100 Undefined
1101 Undefined
1110 Undefined
1111 Undefined
11–6
Reserved
This read-only field is reserved and always has the value zero.
5–0
Reserved
This field is reserved.
Memory map and register definition
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
224 Freescale Semiconductor, Inc.