RFM42 Datasheet, PDF (97/110 Pages) –

RFM42/43
Register 72h. Frequency Deviation
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
fd[7:0]
Type
R/W
Reset value = 00100000
Bit
Name
Frequency Deviation Setting.
7:0
fd[7:0]
See formula above.
Function
Note: It's recommended to use modulation index of 1 or higher (maximum allowable modulation index is 32). The modulation
index is defined by 2FN/FR were FD is the deviation and RB is the data rate. When Manchester coding is enabled the
modulation index is defined by FD/RB.
Register 73h. Frequency Offset 1
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
fo[7:0]
Type
R/W
Reset value = 00000000
Bit
Name
Function
Frequency Offset Setting.
7:0
fo[7:0] The frequency offset can be calculated as Offset = 156.25 Hz x (hbsel + 1) x fo[7:0].
fo[9:0] is a twos complement value.
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