Registers
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MDMCTRL0 (0x6190) – Modem Configuration
Bit
Name Reset R/W Description
No.
7:6
FOC_DECAY[1:0]
00 R/W Controls decay ratio of frequency offset compensation mechanism. Value
by which to increment preamble cost function at each decay
00: 8
01: 16
10: 32
11: 64
5
TX_IF
0 R/W 0: Modulation is done at an IF set by rfr_tx_tone.
1: Modulator outputs tone set by rfr_tx_tone.
4:1
MODULATION[3:0]
0010 R/W Modulation scheme
0010: GFSK 250-kHz deviation, 1-Mbps data rate
0011: GFSK 500-kHz deviation, 2-Mbps data rate
0100: GFSK 160-kHz deviation, 250-kbps data rate
0110: GFSK 160-kHz deviation, 1-Mbps data rate
0111: GFSK 320-kHz deviation, 2-Mbps data rate
1000: MSK, 250-kbps data rate
1001: MSK, 500-kbps data rate
Others: Reserved
0
PHASE_INVERT
0 R/W Set one of two RF modulation modes for Rx / Tx
0: Normal (binary 0 represented with negative frequency deviation, binary
1 represented with positive frequency deviation)
1: Inverted phase (binary 0 represented with positive frequency deviation,
binary 1 represented with negative frequency deviation)
MDMCTRL1 (0x6191) – Modem Configuration
Bit
Name Reset R/W Description
No.
7:6
FOC_MODE
01 R/W Frequency-offset average filter behavior
00: No frequency-offset compensation done
01: Freeze frequency-offset estimate after sync
10: Continuously estimate and remove frequency offset
11: Freeze the frequency-offset estimate after sync, use double decay rate
5 – 0 R0 Reserved
4:0
CORR_THR[4:0]
0x0F R/W Demodulator correlator threshold value, used in sync search. Optimal
threshold value depends on SW_CONF.SW_LEN. CORR_THR adjusts
how the receiver synchronizes to data from the radio. If threshold is set
too low, sync can more easily be found on noise. If set too high, the
sensitivity is reduced but sync is not likely to be found on noise.
340
CC2541 Proprietary Mode Radio SWRU191C– April 2009–Revised January 2012
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