Specifications

CC1101
SWRS061I Page 77 of 98
0x12: MDMCFG2 – Modem Configuration
Bit
Field Name
Reset
R/W
Description
7
DEM_DCFILT_OFF
0
R/W
Disable digital DC blocking filter before demodulator.
0 = Enable (better sensitivity)
1 = Disable (current optimized). Only for data rates
≤ 250 kBaud
The recommended IF frequency changes when the DC blocking is disabled.
Please use SmartRF Studio [5] to calculate correct register setting.
6:4
MOD_FORMAT[2:0]
0 (000)
R/W
The modulation format of the radio signal
Setting
Modulation format
0 (000)
2-FSK
1 (001)
GFSK
2 (010)
-
3 (011)
ASK/OOK
4 (100)
4-FSK
5 (101)
-
6 (110)
-
7 (111)
MSK
MSK is only supported for data rates above 26 kBaud
3
MANCHESTER_EN
0
R/W
Enables Manchester encoding/decoding.
0 = Disable
1 = Enable
2:0
SYNC_MODE[2:0]
2 (010)
R/W
Combined sync-word qualifier mode.
The values 0 (000) and 4 (100) disables preamble and sync word
transmission in TX and preamble and sync word detection in RX.
The values 1 (001), 2 (010), 5 (101) and 6 (110) enables 16-bit sync word
transmission in TX and 16-bits sync word detection in RX. Only 15 of 16 bits
need to match in RX when using setting 1 (001) or 5 (101). The values 3 (011)
and 7 (111) enables repeated sync word transmission in TX and 32-bits sync
word detection in RX (only 30 of 32 bits need to match).
Setting
Sync-word qualifier mode
0 (000)
No preamble/sync
1 (001)
15/16 sync word bits detected
2 (010)
16/16 sync word bits detected
3 (011)
30/32 sync word bits detected
4 (100)
No preamble/sync, carrier-sense
above threshold
5 (101)
15/16 + carrier-sense above threshold
6 (110)
16/16 + carrier-sense above threshold
7 (111)
30/32 + carrier-sense above threshold