CC2550-RTR1 datasheet(40/55 Pages) TI

40 / 55 page

CC2550

PRELIMINARY Data Sheet (Rev.1.2)

SWRS039A

Page 40 of 54

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

⋅

The default frequency word gives a base frequency of 2464 MHz,

assuming a 26.0 MHz crystal. With the default channel spacing

settings, the following FREQ2 values and channel numbers can be

used:

FREQ2

Base frequency

Frequency range (CHAN

numbers)

91 (0x5B)

2386 MHz

2400.2-2437 MHz (71-255)

92 (0x5C)

2412 MHz

2412-2463 MHz (0-255)

93 (0x5D)

2438 MHz

2431-2483.4 MHz (0-227)

94 (0x5E)

2464 MHz

2464-2483.4 MHz (0-97)

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 on the transceiver version

3:0

DRATE_E[3:0]

12 (1100)

R/W

The exponent of the user specified symbol rate

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