RFM22
Register 72h. Frequency Deviation
Bit
D7
D6
D5
D4
D3
D2
D1
D0
fd[7:0]
R/W
Name
Type
Reset value = 00100000
Bit
Name
Function
Frequency Deviation Setting.
7:0
fd[7:0]
See formula above.
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
fo[7:0]
R/W
Name
Type
Reset value = 00000000
Bit
Name
Function
Frequency Offset Setting.
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. Reading from this register will give the AFC
correction last results, not this register value.
7:0
fo[7:0]
Reading from this register will give the AFC correction last results, not this register value.
136
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