EFM32WG Datasheet, PDF (371/834 Pages) List of Unclassifed Manufacturers – The EFM32WG Wonder Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive applications.

Offset
0x3C404
Reset
Access
Name
...the world's most energy friendly microcontrollers
Bit Position
Bit
31:17
16
15:0
Name
Reset
Access Description
Reserved
To ensure compatibility with future devices, always write bits to 0. More information in Section 2.1 (p. 3)
HFIRRLDCTRL
0
RW
Reload Control
This bit allows dynamic reloading of the HFIR register during run time. This bit needs to be programmed during initial configuration
and its value should not be changed during runtime.
Value
0
1
Mode
STATIC
DYNAMIC
Description
The HFIR cannot be reloaded dynamically.
The HFIR can be dynamically reloaded during runtime.
FRINT
0x17D7
RW
Frame Interval
The value that the application programs to this field specifies the interval between two consecutive SOFs (FS) or Keep-Alive tokens
(LS). This field contains the number of PHY clocks that constitute the required frame interval. The application can write a value to
this register only after the Port Enable bit of the Host Port Control and Status register (USB_HPRT.PRTENA) has been set. If no
value is programmed, the core calculates the value based on the PHY clock specified in the FS/LS PHY Clock Select field of the
Host Configuration register (USB_HCFG.FSLSPCLKSEL). Do not change the value of this field after the initial configuration. Set to
48000 (1 ms at 48 MHz) for FS and 6000 (1 ms at 6 MHz) for LS.
15.6.30 USB_HFNUM - Host Frame Number/Frame Time Remaining
Register
This register indicates the current frame number. It also indicates the time remaining (in terms of the
number of PHY clocks) in the current frame.
Offset
0x3C408
Bit Position
Reset
Access
Name
Bit
31:16
15:0
Name
Reset
Access Description
FRREM
0x0000
R
Frame Time Remaining
Indicates the amount of time remaining in the current Frame, in terms of PHY clocks. This field decrements on each PHY clock. When
it reaches zero, this field is reloaded with the value in the Frame Interval register and a new SOF is transmitted on the USB.
FRNUM
0x3FFF
R
Frame Number
This field increments when a new SOF is transmitted on the USB, and is reset to 0 when it reaches 0x3FFF.
2013-05-08 - Wonder Gecko Family - d0233_Rev0.50
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