CHANSPC _ E
xosc
channel
18
f
f
(256 CHANSPC _ M) 2
CHAN
2
D
=
´
+
´
´
[
]
xosc
carrier
16
f
f
FREQ 23 : 0
2
=
´
SWRS037B – JANUARY 2006 – REVISED MARCH 2015
Table 5-23. 0x0D: FREQ2 – Frequency Control Word, High Byte
BIT
FIELD
TYPE
RESET
DESCRIPTION
7:6
FREQ[23:22]
R
0x0
FREQ[23:22] is always 0 (the FREQ2 register
is less than 36 with 26 MHz or higher crystal
frequency).
5:0
FREQ[21:16]
R/W
0x1E
FREQ[23:0] is the base frequency for the
frequency synthesiser in increments of
F
XOSC
/ 216.
(6)
Table 5-24. 0x0E: FREQ1 – Frequency Control Word, Middle Byte
BIT
FIELD
TYPE
RESET
DESCRIPTION
7:0
FREQ[15:8]
R/W
0xC4
Ref. FREQ2 register.
Table 5-25. 0x0F: FREQ0 – Frequency Control Word, Low Byte
BIT
FIELD
TYPE
RESET
DESCRIPTION
7:0
FREQ[7:0]
R/W
0xEC
Ref. FREQ2 register.
Table 5-26. 0x10: MDMCFG4 – Modulator Configuration
BIT
FIELD
TYPE
RESET
DESCRIPTION
7:4
Reserved
R0
0x08
Defined on the transceiver version (CC1101).
3:0
DRATE_E[3:0]
R/W
0x0C
The exponent of the user specified symbol
rate.
Table 5-27. 0x11: MDMCFG3 – Modulator Configuration
BIT
FIELD
TYPE
RESET
DESCRIPTION
7:0
DRATE_M[7:0]
R/W
0x22
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 9th bit is a hidden ‘1’. The
resulting data rate is:
(7)
The default values give a data rate of 115.051 kBaud (closest
setting to 115.2 kBaud), assuming a 26.0 MHz crystal.
44
Detailed Description
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