EFM32WG Datasheet, PDF (136/834 Pages) List of Unclassifed Manufacturers – The EFM32WG Wonder Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive applications.

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Bit
17
16:14
13
12:11
10:9
8
7
6:5
4
3:2
1:0
Name
Reset
Access Description
Value
0
1
2
3
Mode
8CYCLES
1KCYCLES
16KCYCLES
32KCYCLES
Description
Timeout period of 8 cycles.
Timeout period of 1024 cycles.
Timeout period of 16384 cycles.
Timeout period of 32768 cycles.
LFXOBUFCUR
0
RW
LFXO Boost Buffer Current
This value has been set during calibration and should not be changed.
HFCLKDIV
0x0
RW
HFCLK Division
Use to divide HFCLK frequency by (HFCLKDIV + 1).
LFXOBOOST
1
RW
LFXO Start-up Boost Current
Adjusts start-up boost current for LFXO.
Value
0
1
Mode
70PCENT
100PCENT
Description
70 %.
100 % (default).
LFXOMODE
0x0
RW
LFXO Mode
Set this to configure the external source for the LFXO. The oscillator setting takes effect when 1 is written to LFXOEN in
CMU_OSCENCMD. The oscillator setting is reset to default when 1 is written to LFXODIS in CMU_OSCENCMD.
Value
0
1
2
Mode
XTAL
BUFEXTCLK
DIGEXTCLK
Description
32.768 kHz crystal oscillator.
An AC coupled buffer is coupled in series with LFXTAL_N pin, suitable for external
sinus wave (32.768 kHz).
Digital external clock on LFXTAL_N pin. Oscillator is effectively bypassed.
HFXOTIMEOUT
0x3
RW
Configures the start-up delay for HFXO.
HFXO Timeout
Value
0
1
2
3
Mode
8CYCLES
256CYCLES
1KCYCLES
16KCYCLES
Description
Timeout period of 8 cycles.
Timeout period of 256 cycles.
Timeout period of 1024 cycles.
Timeout period of 16384 cycles.
Reserved
To ensure compatibility with future devices, always write bits to 0. More information in Section 2.1 (p. 3)
HFXOGLITCHDETEN
0
RW
HFXO Glitch Detector Enable
This bit enables the glitch detector which is active as long as the start-up ripple-counter is counting. A detected glitch will reset the
ripple-counter effectively increasing the start-up time. Once the ripple-counter has timed-out, glitches will not be detected.
HFXOBUFCUR
0x1
RW
HFXO Boost Buffer Current
The current level in the HFXO buffer should be set to default value when operating on 32 MHz or below. When operating on
frequencies above 32 MHz, the buffer current level should be set to 3.
Value
1
3
Mode
BOOSTUPTO32MHZ
BOOSTABOVE32MHZ
Description
Boost Buffer Current level when HFXO is below or equal to 32 MHz.
Boost Buffer Current Level when HFXO is above 32 MHz.
Reserved
To ensure compatibility with future devices, always write bits to 0. More information in Section 2.1 (p. 3)
HFXOBOOST
0x3
RW
Used to adjust start-up boost current for HFXO.
HFXO Start-up Boost Current
Value
0
1
2
3
Mode
50PCENT
70PCENT
80PCENT
100PCENT
Description
50 %.
70 %.
80 %.
100 % (default).
HFXOMODE
0x0
RW
HFXO Mode
2013-05-08 - Wonder Gecko Family - d0233_Rev0.50
136
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