USBx_USBTRC0 field descriptions (continued)Field Description2USB_CLK_RECOVERY_INTCombined USB Clock Recovery interrupt statusThis read-only field will be set to value high at 1'b1 when any of USB clock recovery interrupt conditionsare detected and those interrupts are unmasked.For customer use the only unmasked USB clock recovery interrupt condition results from an overflow ofthe frequency trim setting values indicating that the frequency trim calculated is out of the adjustmentrange of the IRC48M output clock.To clear this bit after it has been set, Write 0xFF to register USB_CLK_RECOVER_INT_STATUS.1SYNC_DETSynchronous USB Interrupt Detect0 Synchronous interrupt has not been detected.1 Synchronous interrupt has been detected.0USB_RESUME_INTUSB Asynchronous Interrupt0 No interrupt was generated.1 Interrupt was generated because of the USB asynchronous interrupt.33.5.22 Frame Adjust Register (USBx_USBFRMADJUST)Address: 4007_2000h base + 114h offset = 4007_2114hBit 7 6 5 4 3 2 1 0Read ADJWriteReset 0 0 0 0 0 0 0 0USBx_USBFRMADJUST field descriptionsField DescriptionADJ Frame AdjustmentIn Host mode, the frame adjustment is a twos complement number that adjusts the period of each USBframe in 12-MHz clock periods. A SOF is normally generated every 12,000 12-MHz clock cycles. TheFrame Adjust Register can adjust this by -128 to +127 to compensate for inaccuracies in the USB 48-MHzclock. Changes to the ADJ bit take effect at the next start of the next frame.33.5.23 USB Clock recovery control (USBx_CLK_RECOVER_CTRL)Signals in this register control the crystal-less USB clock mode in which the internalIRC48M oscillator is tuned to match the clock extracted from the incoming USB datastream.The IRC48M internal oscillator module must be enabled in registerUSB_CLK_RECOVER_IRC_EN for this mode.Memory map/Register definitionsKL27 Sub-Family Reference Manual , Rev. 5, 01/2016558 Freescale Semiconductor, Inc.
