CC1110Fx / CC1111Fx
CLKCON (0xC6) – Clock Control
Bit
Name
Reset
R/W
Description
7
OSC32K
1
R/W
32 kHz clock oscillator select. The HS RCOSC must be selected as system
clock source when this bit is to be changed.
0
1
32.768 kHz crystal oscillator
Low power RC oscillator (32 – 36 kHz for CC1110Fx and 32 kHz for
CC1111Fx)
Note: This bit is not retained in PM2 and PM3. After re-entry to active mode
from one of these power modes this bit will be at the reset value 1.
6
OSC
1
R/W
System clock oscillator select.
0
1
High speed crystal oscillator
HS RC oscillator
This setting will only take effect when the selected oscillator is powered up and
stable. If the high speed crystal oscillator is not powered up, it should be
enabled by setting SLEEP.OSC_PDto 0 prior to selecting it as source.If the HS
RCOSC is to be the source and it is powered down, setting this bit will turn it
on.
5:3
TICKSPD[2:0]
001
R/W
Timer ticks output setting. The value of TICKSPDcannot be higher than
CLKSPD.
CLKCON.OSC=0
CLKCON.OSC=1
HS XOSC used as clock source
for system clock
Calibrated HS RCOSC used as
clock source for system clock
000
001
010
011
100
101
110
111
fRef
26 MHz
NA
NA
fRef /2
fRef /4
fRef /8
fRef /16
fRef /32
fRef /64
fRef /128
13 MHz
fRef /2
fRef /4
fRef /8
fRef /16
fRef /32
fRef /64
fRef /128
13 MHz
6.5 MHz
6.5 MHz
3.25 MHz
1.625 MHz
812.5 kHz
406.25 kHz
203.125 kHz
3.25 MHz
1.625 MHz
812.5 kHz
406.25 kHz
203.125 kHz
f
Ref = fxosc for CC1110Fx and fRef = fxosc/2 for CC1111Fx
Numbers above is for CC1110Fx with fxosc = 26 MHz
2:0
CLKSPD[2:0]
001
R/W
Clock speed setting. When a new CLKSPDvalue is written, the new setting is
read when the clock has changed.
CLKCON.OSC=0
CLKCON.OSC=1
HS XOSC used as clock source
for system clock
Calibrated HS RCOSC used as
clock source for system clock
000
001
010
011
100
101
110
111
fRef
26 MHz
NA
NA
fRef /2
fRef /4
fRef /8
fRef /16
fRef /32
fRef /64
fRef /128
13 MHz
fRef /2
fRef /4
fRef /8
fRef /16
fRef /32
fRef /64
fRef /128
13 MHz
6.5 MHz
6.5 MHz
3.25 MHz
1.625 MHz
812.5 kHz
406.25 kHz
203.125 kHz
3.25 MHz
1.625 MHz
812.5 kHz
406.25 kHz
203.125 kHz
fRef = fxosc for CC1110Fx and fRef = fxosc/2 for CC1111Fx
Numbers above is for CC1110Fx with fxosc = 26 MHz
SWRS033E
Page 83 of 239
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