NXP Semiconductors K22F series - IRC48 M Oscillator Enable Register (Usbx_Clk_Recover_Irc_En)

USBx_CLK_RECOVER_CTRL field descriptions (continued)
Field Description
0
Reserved
This field is reserved.
Default should not be changed
43.4.30 IRC48M oscillator enable register
(USBx_CLK_RECOVER_IRC_EN)
Controls basic operation of the on-chip IRC48M module used to produce nominal
48MHz clocks for USB crystal-less operation and other functions.
See additional information about the IRC48M operation in the Clock Distribution
chapter.
Address:
4007_2000h base + 144h offset = 4007_2144h
Bit 7 6 5 4 3 2 1 0
Read
Reserved IRC_EN REG_EN
Write
Reset
0 0 0 0 0 0 0 1
USBx_CLK_RECOVER_IRC_EN field descriptions
Field Description
7–2
Reserved
This field is reserved.
1
IRC_EN
IRC48M enable
This bit is used to enable the on-chip IRC48Mhz module to generate clocks for crystal-less USB. It can be
used for FS USB device mode operation. This bit must be set before using the crystal-less USB clock
configuration.
0 Disable the IRC48M module (default)
1 Enable the IRC48M module
0
REG_EN
IRC48M regulator enable
This bit is used to enable the local analog regulator for IRC48Mhz module. This bit must be set if user
wants to use the crystal-less USB clock configuration.
0 IRC48M local regulator is disabled
1 IRC48M local regulator is enabled (default)
Memory map/Register definitions
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
1108 NXP Semiconductors