CC2550 Datasheet, PDF (38/50 Pages) Texas Instruments – Single Chip Low Cost Low Power RF-Transmitter

CC2550
Bit Field Name
7:0 DEVICE_ADDR[7:0]
0x09: ADDR – Device address
Reset R/W Description
0 (0x00) R/W Address used for packet filtration. Optional broadcast
addresses are 0 (0x00) and 255 (0xFF).
Bit Field Name
7:0 CHAN[7:0]
0x0A: CHANNR – Channel number
Reset
R/W Description
0 (0x00)
R/W The 8-bit unsigned channel number, which is multiplied by
the channel spacing setting and added to the base
frequency.
Bit Field Name
7:6 FREQ[23:22]
5:0 FREQ[21:16]
0x0D: FREQ2 – Frequency control word, high byte
Reset R/W Description
1 (01)
30
(0x1E)
R
FREQ[23:22] is always binary 01 (the FREQ2 register is in the range
85 to 95 with 26MHz-27MHz crystal)
R/W FREQ[23:0] is the base frequency for the frequency synthesiser in
increments of F_XOSC/2¹⁶.
[ ] f_carrier
=
f _XOSC
2¹⁶
⋅ FREQ
23 : 0
The default frequency word gives a base frequency of 2464MHz,
assuming a 26.0MHz 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)
2386MHz
2400.2MHz-2437MHz (71-255)
92 (0x5C)
2412MHz
2412MHz-2463MHz (0-255)
93 (0x5D)
2438MHz
2431MHz-2483.4MHz (0-227)
94 (0x5E)
2464MHz
2464MHz-2483.4MHz (0-97)
Bit Field Name
7:0 FREQ[15:8]
0x0E: FREQ1 – Frequency control word, middle byte
Reset
R/W Description
196 (0xC4) R/W Ref. FREQ2 register
Bit Field Name
7:0 FREQ[7:0]
0x0F: FREQ0 – Frequency control word, low byte
Reset
R/W Description
236 (0xEC) R/W Ref. FREQ2 register
Bit Field Name
7:4 Reserved
3:0 DRATE_E[3:0]
0x10: MDMCFG4 – Modulator configuration
Reset
R/W Description
12 (1100)
R0 Defined on the transceiver version
R/W The exponent of the user specified symbol rate
Preliminary Data Sheet (rev. 1.1) SWRS039
Page 38 of 51