User manual
...the world's most energy friendly microcontrollers
2012-04-24 - Giant Gecko Family - d0053_Rev0.96 137
www.energymicro.com
11.5 Register Description
11.5.1 CMU_CTRL - CMU Control Register
Offset Bit Position
0x000
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Reset
0
0
0x0
0x0
0x3
0
0x0
0
0x0
0x3
0
0x1
0x3
0x0
Access
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
Name
HFLE
DBGCLK
CLKOUTSEL1
CLKOUTSEL0
LFXOTIMEOUT
LFXOBUFCUR
HFCLKDIV
LFXOBOOST
LFXOMODE
HFXOTIMEOUT
HFXOGLITCHDETEN
HFXOBUFCUR
HFXOBOOST
HFXOMODE
Bit Name Reset Access Description
31 Reserved
To ensure compatibility with future devices, always write bits to 0. More information in Section 2.1 (p. 3)
30 HFLE 0 RW High-Frequency LE Interface
Set to allow access to LE peripherals when running at frequencies higher than 32 MHz
29 Reserved
To ensure compatibility with future devices, always write bits to 0. More information in Section 2.1 (p. 3)
28 DBGCLK 0 RW Debug Clock
Select clock used for the debug system.
Value Mode Description
0 AUXHFRCO AUXHFRCO is the debug clock
1 HFCLK The system clock is the debug clock
27:26 Reserved
To ensure compatibility with future devices, always write bits to 0. More information in Section 2.1 (p. 3)
25:23 CLKOUTSEL1 0x0 RW Clock Output Select 1
Controls the clock output multiplexer. To actually output on the pin, set CLKOUT1PEN in CMU_ROUTE.
Value Mode Description
0 LFRCO LFRCO (directly from oscillator)
1 LFXO LFXO (directly from oscillator)
2 HFCLK HFCLK
3 LFXOQ LFXO (qualified)
4 HFXOQ HFXO (qualified)
5 LFRCOQ LFRCO (qualified)
6 HFRCOQ HFRCO (qualified)
7 AUXHFRCOQ AUXHFRCO (qualified)
22:20 CLKOUTSEL0 0x0 RW Clock Output Select 0
Controls the clock output multiplexer. To actually output on the pin, set CLKOUT0PEN in CMU_ROUTE.
Value Mode Description
0 HFRCO HFRCO (directly from oscillator)
1 HFXO HFXO (directly from oscillator)
2 HFCLK2 HFCLK/2
3 HFCLK4 HFCLK/4
4 HFCLK8 HFCLK/8
5 HFCLK16 HFCLK/16
6 ULFRCO ULFRCO (directly from oscillator)
7 AUXHFRCO AUXHFRCO (directly from oscillator)
19:18 LFXOTIMEOUT 0x3 RW LFXO Timeout
Configures the start-up delay for LFXO.