Data Sheet
CC1101
SWRS061B Page 70 of 93
0x13: MDMCFG1– Modem Configuration
Bit Field Name Reset R/W Description
7 FEC_EN 0 R/W Enable Forward Error Correction (FEC) with interleaving for
packet payload
0 = Disable
1 = Enable (Only supported for fixed packet length mode, i.e.
PKTCTRL0.LENGTH_CONFIG=0)
6:4 NUM_PREAMBLE[2:0] 2 (010) R/W Sets the minimum number of preamble bytes to be transmitted
Setting Number of preamble bytes
0 (000) 2
1 (001) 3
2 (010) 4
3 (011) 6
4 (100) 8
5 (101) 12
6 (110) 16
7 (111) 24
3:2 Reserved R0
1:0 CHANSPC_E[1:0] 2 (10) R/W 2 bit exponent of channel spacing
0x14: MDMCFG0– Modem Configuration
Bit Field Name Reset R/W Description
7:0 CHANSPC_M[7:0] 248 (0xF8) R/W 8-bit mantissa of channel spacing. The channel spacing is
multiplied by the channel number CHAN and added to the base
frequency. It is unsigned and has the format:
()
ECHANSPC
XOSC
CHANNEL
MCHANSPC
f
f
_
18
2_256
2
⋅+⋅=∆
The default values give 199.951 kHz channel spacing (the
closest setting to 200 kHz), assuming 26.0 MHz crystal
frequency.