CC2510Fx / CC2511Fx
CLKCON (0xC6) - Clock Control
Bit
Field Name
Reset
R/W
Description
7
OSC32K
1
R/W
32 kHz clock oscillator select. The HS RCOSC must be clock source for the
system clock (CLKCON.OSC=1) when this bit is to be changed.
0
1
32.768 kHz crystal oscillator
Low power RC oscillator (32 - 36 kHz for CC2510Fx and 32 kHz for
CC2511Fx)
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
If the selected oscillator is not already powered up when this bit is set/cleared, it
will be powered up by selecting it.
This setting will only take effect when the selected oscillator is powered up and
stable and when the calibration of the HS RCOSC and initial calibration of the
low power RC oscillator is completed.
Note: It is not possible to change from high speed RC oscillator to high speed
crystal oscillator when SLEEP.MODE≠00
5:3
TICKSPD[2:0]
001
R/W
Timer tick speed 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
fRef = fxosc for CC2510Fx and fRef = fxosc/2 for CC2511Fx
Numbers above are for CC2510Fx with fxosc = 26 MHz
2:0
CLKSPD[2:0]
001
R/W
System 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 CC2510Fx and fRef = fxosc/2 for CC2511Fx
Numbers above are for CC2510Fx with fxosc = 26 MHz
SWRS055F
Page 79 of 241
TI [ TEXAS INSTRUMENTS ]
