CC1111F32RSP datasheet(81/247 Pages) TI

81 / 247 page

CC1110Fx / CC1111Fx

SWRS033G

Page 81 of 244

Maximum Data Rate [kBaud]

CLKCON.CLKSPD

MSK

GFSK,

OOK

and ASK

2-FSK

000

500

250

500

001

500

250

500

010

500

250

500

011

500

250

500

100

400

250

400

101

200

110

100

111

Table 49: System Clock Speed vs. Data Rate

12.1.5.3

Low Speed Oscillators (32 kHz

clock source)

Two low speed oscillators are present in the

device:

 Low speed crystal oscillator (32.768

kHz)

 Low power RC oscillator (34.667 - 36

kHz for

CC1110Fx and 32 kHz for CC1111Fx)

The low speed crystal oscillator is designed to

operate at 32.768 kHz and provide a stable

clock

signal

for

systems

requiring

time

accuracy. The low power RC oscillator run at

fXOSC / 750 for CC1110Fx and fXOSC / 1500 for

CC1111Fx, when calibrated. The calibration can

only take place when the low power RC

oscillator is running and the high speed crystal

oscillator is enabled and stable, and is initiated

by selecting the HS XOSC as the clock source

for the system clock (CLKCON.OSC=0).

The

low power RC oscillator should be used to

reduce

cost

and

power

consumption

compared to the 32.768 kHz crystal oscillator

solution. The two low speed oscillators can not

be operated simultaneously.

By default, after a reset, the low power RC

oscillator is enabled and selected as the 32

kHz clock source. The RC oscillator consumes

less power, but is less accurate than the

32.768 kHz crystal oscillator. Refer to Section

6.5 and 6.6 for characteristics of

these

oscillators.

The CLKCON.OSC32K bit selects the source of

the 32 kHz clock. This bit must only be

changed while using the HS RCOSC as the

system clock source. If CLKCON.OSC32K=1,

changing the system clock source to the HS

XOSC will initiate the calibration of the low

power RC oscillator. The calibration of the low

power RC oscillator is continuously performed

as long as CLKCON.OSC=0 and the device is

in active mode or PM0. The result of the

calibration is a RC clock running at 34.667 - 36

kHz for

CC1110Fx and 32 kHz for CC1111Fx.

The low power RCOSC calibration takes

approximately 2 ms. Except for the initial

calibration (first calibration after the HS XOSC

was set as source for the system clock

(CLKCON.OSC=0)),

calibration

will

aborted if one of the following actions is

initiated by SW:

a) Switching the clock source for the

system clock from HS XOSC to HS

RCOSC by setting CLKCON.OSC=1

b) Entering PM{1 - 3}.

If a) or b) is initiated during the initial

calibration, the calibration will complete before

a) or b) will take place (i.e., the HS XOSC will

continue as the clock source for the system

clock for up to 2 ms before the switching takes

place or PM{1 - 3} is entered). If a) or b) is

initiated

after

the

initial

calibration

has

completed, there will be a delay of typically

130 µs from SW initiates a) or b), until the

calibration is being aborted and the system

clock source is changed or PM{1 - 3} is

entered (see Figure 18).

Figure 18: Low Power RCOSC Calibration

Note: During the initial calibration a) or b)

can only be initiated once.

After the initial calibration has completed

and a) or b) is initiated, one must not try to

initiate a) or b) again within the next 130

µs.

CC1111F32RSP Datasheet(PDF) 81 Page - Texas Instruments

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