CC2550-RTY1 datasheet(43/62 Pages) TI2

43 / 62 page

CC2550

SWRS039B

Page 43 of 58

0x0A: CHANNR – Channel Number

Bit

Field Name

Reset

R/W

Description

7:0

CHAN[7:0]

0 (0x00)

R/W

The 8-bit unsigned channel number, which is multiplied by

the channel spacing setting and added to the base

frequency.

0x0D: FREQ2 – Frequency Control Word, High Byte

Bit

Field Name

Reset

R/W

Description

7:6

FREQ[23:22]

1 (01)

FREQ[23:22] is always binary 01 (the FREQ2 register is in the range

85 to 95 with 26-27 MHz crystal)

5:0

FREQ[21:16]

(0x1E)

R/W

FREQ[23:0] is the base frequency for the frequency synthesiser in

increments of FXOSC/2

16.

[]

FREQ

XOSC

carrier

⋅

0x0E: FREQ1 – Frequency Control Word, Middle Byte

Bit

Field Name

Reset

R/W

Description

7:0

FREQ[15:8]

196 (0xC4)

R/W

Ref. FREQ2 register

0x0F: FREQ0 – Frequency Control Word, Low Byte

Bit

Field Name

Reset

R/W

Description

7:0

FREQ[7:0]

236 (0xEC)

R/W

Ref. FREQ2 register

0x10: MDMCFG4 – Modulator Configuration

Bit

Field Name

Reset

R/W

Description

7:4

Reserved

Defined in the transceiver version

3:0

DRATE_E[3:0]

12 (1100)

R/W

The exponent of the user specified symbol rate

0x11: MDMCFG3 – Modulator Configuration

Bit

Field Name

Reset

R/W

Description

7:0

DRATE_M[7:0]

34 (0x22)

R/W

The mantissa of the user specified symbol rate. The symbol

rate is configured using an unsigned, floating-point number

with 9-bit mantissa and 4-bit exponent. The 9

th bit is a

hidden ‘1’. The resulting data rate is:

(

)

XOSC

DRATE

DATA

DRATE

⋅

256

The default values give a data rate of 115.051 kBaud

(closest setting to 115.2 kBaud), assuming a 26.0 MHz

crystal.

CC2550-RTY1 Datasheet(PDF) 43 Page - Texas Instruments

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