EFM32WG Datasheet, PDF (140/834 Pages) List of Unclassifed Manufacturers – The EFM32WG Wonder Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive applications.

Bit
10:8
7:0
...the world's most energy friendly microcontrollers
Name
Reset
Access Description
BAND
0x0
RW
AUXHFRCO Band Select
Write this field to set the frequency band in which the AUXHFRCO is to operate. When changing this setting there will be no glitches
on the HFRCO output, hence it is safe to change this setting even while the system is using the AUXHFRCO. To ensure an accurate
frequency, the AUXTUNING value should also be written when changing the frequency band. The calibrated tuning value for the
different bands can be read from the Device Information page. Flash erase and write use this clock. If it is changed to another value
than the default, MSC_TIMEBASE must also be configured to ensure correct flash erase and write operation.
Value
0
1
2
3
6
7
Mode
14MHZ
11MHZ
7MHZ
1MHZ
28MHZ
21MHZ
Description
14 MHz. NOTE: Also set the TUNING value (bits 7:0) when changing band.
11 MHz. NOTE: Also set the TUNING value (bits 7:0) when changing band.
7 MHz. NOTE: Also set the TUNING value (bits 7:0) when changing band.
1 MHz. NOTE: Also set the TUNING value (bits 7:0) when changing band.
28 MHz. NOTE: Also set the TUNING value (bits 7:0) when changing band.
21 MHz. NOTE: Also set the TUNING value (bits 7:0) when changing band.
TUNING
0x80
RW
AUXHFRCO Tuning Value
This value has been set during calibration and should not be changed.
11.5.7 CMU_CALCTRL - Calibration Control Register
Offset
0x018
Reset
Access
Bit Position
Name
Bit
31:7
6
5:3
2:0
Name
Reset
Access Description
Reserved
To ensure compatibility with future devices, always write bits to 0. More information in Section 2.1 (p. 3)
CONT
0
RW
Set this bit to enable continuous calibration.
DOWNSEL
0x0
RW
Selects clock source for the calibration down-counter.
Continuous Calibration
Calibration Down-counter Select
Value
0
1
2
3
4
5
Mode
HFCLK
HFXO
LFXO
HFRCO
LFRCO
AUXHFRCO
Description
Select HFCLK for down-counter.
Select HFXO for down-counter.
Select LFXO for down-counter.
Select HFRCO for down-counter.
Select LFRCO for down-counter.
Select AUXHFRCO for down-counter.
UPSEL
0x0
RW
Selects clock source for the calibration up-counter.
Calibration Up-counter Select
Value
0
1
2
3
4
Mode
HFXO
LFXO
HFRCO
LFRCO
AUXHFRCO
Description
Select HFXO as up-counter.
Select LFXO as up-counter.
Select HFRCO as up-counter.
Select LFRCO as up-counter.
Select AUXHFRCO as up-counter.
2013-05-08 - Wonder Gecko Family - d0233_Rev0.50
140
www.energymicro.com