RFM42 Datasheet, PDF (59/110 Pages) –

RFM42/43
Register 08h. Operating Mode and Function Control 2
Bit
D7
D6
D5
D4
Name
Reserved
Type
R/w
Reset value = 00000000
D3
autotx
R/w
D2
D1
Reserved
R/w
R/w
D0
ffclrtx
R/w
Bit
7：4
3
2：1
0
Name
Reserved
autotx
Reserved
ffclrtx
Function
Reserved.
Automatic Transmission.
When autotx = 1 the transceiver will enter automatically TX State when the
FIFO is almost full. When the FIFO is empty it will automatically return to the
Idle State.
Reserved.
TX FIFO Reset/Clear.
This has to be a two writes operation: Setting ffclrtx =1 followed by ffclrtx = 0
will clear the contents of the TX FIFO.
Register 09h. 30 MHz Crystal Oscillator Load Capacitance
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
xtalshft
xlc[6:0]
Type
R/w
R/w
Reset value = 01111111
Bit
Name
Function
Additional capacitance to course shift the frequency if xlc[6:0] is not sufficient.
7
xtalshft
Not binary
with xlc[6:0].
6:0
xlc[6:0]
Tuning Capacitance for the 30 MHz XTAL.
59
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