The Datasheet generally doesn't provide an indication in the register tables as to what are the default values.
Could you provide this for each of the 15 registers please?
The only settings that are enabled by default when the part powers up (CE high) are:
Reg 1: CLKout (set to 0100)
Reg 1: XOSC_Enable (set to 1)
Reg 1: XTAL bias (set to 11)
Reg 0: Muxout (set to 000)
Reg 9: 0x000231E9 (i.e. AGC on, with thresholds of 70 and 30)
Other settings in registers 1-6 need to be set in order for them to take effect, i.e. they are not enabled until the register is programmed.
Register 7 is a readback register and register 8 is a power down register and doesn't need to be programmed.
In Rx mode, registers 9 to 14 can be optionally programmed to enable extra features (AFC, SWD etc.). Note that these registers are only used in Rx mode.
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