Texas Instruments CC112 Series, User Manual, Page: 75 / 109

CC112X/CC1175
SWRU295C Page 75 of 108
MDMCFG0 - General Modem Parameter Configuration
Bit no. Name Reset R/W Description
7 MDMCFG0_NOT_USED 0x00 R
6 TRANSPARENT_MODE_EN 0x00 R/W Transparent Mode Enable
0 Transparent mode disabled
1 Transparent mode enabled
5:4 TRANSPARENT_INTFACT 0x00 R/W Transparent Signal Interpolation Factor. The sample rate gives the jitter of the
samples and the sample rate is given by
2 _ _ Factor Decimation
Factor ion Interpolat
Rate Sample
DECFACT CIC BB
f
XOSC
The decimation factor is given by
CHAN_BW.ADC_CIC_DECFACT
while the
interpolation factor is given below
00 1x transparent signal interpolated one time before output (reset)
01 2x transparent signal interpolated two times before output
10 4x transparent signal interpolated four times before output
11 Reserved
3 DATA_FILTER_EN 0x01 R/W Transparent Data Filter and Extended Data Filter Enable. Note that
TRANSPARENT_MODE_EN = 0
this bit should only be set when RX filter
bandwidth/data rate > 10 and
TOC_CFG.TOC_LIMIT = 0
TRANSPARENT_MODE_EN | DATA_FILTER_EN
00 Transparent data filter disabled and extended data filter disabled
01 Transparent data filter disabled and extended data filter enabled
10 Transparent data filter disabled and extended data filter disabled
11 Transparent data filter enabled and extended data filter disabled
2 VITERBI_EN 0x01 R/W Viterbi Detection Enable. Enabling Viterbi detection improves the sensitivity. The
latency from the antenna to the signal is available in the RXFIFO or on the GPIO is
increased by 5 bits for 2-ary modulation formats and 10 bits for 4-ary modulation
formats. Minimum packet length = 2 bytes when Viterbi Detection and 4-(G)FSK is
enabled
0 Viterbi detection disabled
1 Viterbi detection enabled
1:0 MDMCFG0_RESERVED1_0 0x01 R/W For test purposes only, use values from SmartRF Studio
DRATE2 - Data Rate Configuration Exponent and Mantissa [19:16]
Bit no. Name Reset R/W Description
7:4 DATARATE_E 0x04 R/W Data Rate (exponent part)
DATARATE_E > 0:
XOSC
E DATARATE
DATA
f
M DATARATE
R
39
_ 20
2
2 ) _ 2 (
DATARATE_E = 0:
XOSC DATA
f
M DATARATE
R
38
2
_
Modulation Format Bit Rate/Data Rate Ratio
2-(G)FSK 1
4-(G)FSK 2
Manchester Coding 0.5
DSSS Mode 1/Spreading Factor
3:0 DATARATE_M_19_16 0x03 R/W Data Rate (mantissa part [19:16])
DATARATE_E > 0:
XOSC
E DATARATE
DATA
f
M DATARATE
R
39
_ 20
2
2 ) _ 2 (
DATARATE_E = 0:
XOSC DATA
f
M DATARATE
R
38
2
_