SIM_SOPT2[RTCCLKOUTSEL]
RTC_CLKOUT
RTC 1Hz clock
RTC 32kHz clock
RTC_CR[CLKO]
SIM_SOPT1[OSC32KOUT]
PTE0/CLKOUT32K
Pad
interface
PTE26/CLKOUT32K
Pad
interface
SIM_SOPT1[OSC32KSEL]
OSC32KCLK
ERCLK32K
00
10
1
0
10
01
Other
modules
Other
modules
LPO
11
Figure 5-6. RTC_CLKOUT and CLKOUT32K generation
5.7.8
USB FS OTG Controller clocking
The USB FS OTG controller is a bus master attached to the crossbar switch. As such, it
uses the system clock.
NOTE
For the USB FS OTG controller to operate, the minimum
system clock frequency is 20 MHz.
The USB OTG controller also requires a 48 MHz clock. The clock source options are
shown below.
Module clocks
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
164 NXP Semiconductors
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