SIM_SOPT1 field descriptions (continued)
Field Description
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 field is reserved.
This read-only field is reserved and always has the value 0.
19–18
OSC32KSEL
32K oscillator clock select
Selects the 32 kHz clock source (ERCLK32K) for LPTMR. This field is reset only on POR/LVD.
00 System oscillator (OSC32KCLK)
01 Reserved
10 RTC 32.768kHz oscillator
11 LPO 1 kHz
17–16
OSC32KOUT
32K Oscillator Clock Output
Outputs the ERCLK32K on the selected pin in all modes of operation (including LLS/VLLS and System
Reset), overriding the existing pin mux configuration for that pin. This field is reset only on POR/LVD.
00 ERCLK32K is not output.
01 ERCLK32K is output on PTE0.
10 ERCLK32K is output on PTE26.
11 Reserved.
15–12
RAMSIZE
RAM size
This field specifies the amount of system RAM available on the device.
0001 8 KB
0011 16 KB
0100 24 KB
0101 32 KB
0110 48 KB
0111 64 KB
1000 96 KB
1001 128 KB
1011 256 KB
1101 512 KB
1111 1024 KB
11–6
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
Reserved This field is reserved.
Memory map and register definition
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
262 NXP Semiconductors
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