Texas Instruments CC2500 - Page 67

CC2500
S
WRS040
C
Page
67
of
89
0x12: MDMCFG2
–
Modem C
onfiguration
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 us
e
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)
OOK
4 (100)
-
5 (101)
-
6 (110)
-
7 (111)
MSK
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 s
etting 1 (001) or 5 (101).
The values 3 (011) and 7 (111) enables repe
ated sync
word transmission in T
X 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 syn
c 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 (1
11)
30/32 + carrier
-
sense above threshold