CC2550_06 Datasheet, PDF (43/55 Pages) Texas Instruments – Single Chip Low Cost Low Power RF Transmitter

CC2550
0x15: DEVIATN – Modulator deviation setting
Bit Field Name
Reset
R/W Description
7 Reserved
6:4 DEVIATION_E[2:0]
3 Reserved
2:0 DEVIATION_M[2:0]
4 (100)
7 (111)
R0
R/W Deviation exponent
R0
R/W When MSK modulation is enabled:
Sets fraction of symbol period used for phase change.
When FSK modulation is enabled:
Deviation mantissa, interpreted as a 4-bit value with MSB
implicit 1. The resulting FSK deviation is given by:
f _dev
=
f _xosc
2¹⁷
⋅ (8 + DEVIATION _ M ) ⋅ 2^{DEVIATION _ E}
The default values give ±47.607 kHz deviation, assuming
26.0 MHz crystal frequency.
0x17: MCSM1 – Main Radio Control State Machine configuration
Bit Field Name
Reset
R/W Description
7:6 Reserved
5:2 Reserved
1:0 TXOFF_MODE[1:0]
0 (00)
R0
R0 Defined on the transceiver version
R/W Select what should happen when a packet has been sent
(TX)
Setting Next state after finishing packet transmission
0 (00) IDLE
1 (01) FSTXON
2 (10) Stay in TX (start sending preamble)
3 (11)
Do not use, not implemented on CC2550
(Go to RX)
PRELIMINARY Data Sheet (Rev.1.2) SWRS039A
Page 43 of 54