C2510Fx / CC2511Fx
0xDF0F: MDMCFG1 – Modem Configuration
Bit Field Name
FEC_EN
Reset
R/W
Description
7
0
R/W
Enable Forward Error Correction (FEC) with interleaving for packet
payload. FEC is only supported for fixed packet length mode, i.e.
PKTCTRL0.LENGTH_CONFIG=0
0
1
Disable
Enable
6:4 NUM_PREAMBLE[2:0] 010
R/W
Sets the minimum number of preamble bytes to be transmitted
000
001
010
011
100
101
110
111
2
3
4
6
8
12
16
24
3:2
-
R0
Not used
1:0 CHANSPC_E[1:0]
10
R/W
2 bit exponent of channel spacing
0xDF10: MDMCFG0 – Modem Configuration
Bit Field Name
Reset
R/W
Description
7:0 CHANSPC_M[7:0]
0xF8
R/W
8-bit mantissa of channel spacing (initial 1 assumed). The channel
spacing is multiplied by the channel number CHANand added to the base
frequency. It is unsigned and has the format:
fref
218
∆fCHANNEL
=
⋅
(
256 + CHANSPC _ M
⋅ 2CHANSPC _ E
)
The default values give 199.951 kHz channel spacing when fRef = 26
MHz and 184.570 kHz when fRef = 24 MHz.
0xDF11: DEVIATN – Modem Deviation Setting
Bit Field Name
Reset
R/W
Description
7
-
R0
Not used
6:4 DEVIATION_E[2:0]
100
-
R/W
R0
Deviation exponent
Not used
3
2:0 DEVIATION_M[2:0]
111
R/W
When MSK modulation is enabled:
Sets fraction of symbol period used for phase change. Refer to the
SmartRF® Studio software [8] for correct DEVIATNsetting when using
MSK.
When 2-FSK/GFSK modulation is enabled:
Deviation mantissa, interpreted as a 4-bit value with MSB implicit 1. The
resulting deviation is given by:
fref
217
fdev
=
⋅(8 + DEVIATION _ M )⋅2DEVIATION _ E
The default values give ±47.607kHz deviation when fRef = 26 MHz and
43.945 kHz when fRef = 24 MHz.
SWRS055D
Page 218 of 243
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