RFM22
Register 20h. Clock Recovery Oversampling Rate
Bit
D7
D6
D5
D4
D3
D2
D1
D0
rxosr[7:0]
R/W
Name
Type
Reset value = 01100100
Bit
Name
rxosr[7:0]
Function
Oversampling Rate.
3 LSBs are the fraction, default = 0110 0100 = 12.5 clock cycles per data bit
7：0
The offset can be calculated as follows:
Rb×（1+enmanch）×220+ndec_exp
500×(1+2×dwn3_bypass)
ncoff =
The default values for register 20h to 23h gives 40 kbps RX_DR with Manchester coding is disenabled.
Register 21h. Clock Recovery Offset 2
Bit
D7
D6
rxosr[10:8]
R/W
D5
D4
stallctrl
R/W
D3
D2
D1
D0
ncoff[19:16]
Name
Type
R/W
Reset value = 00000001
Bit
7:5
4
Name
Function
Oversampling Rate.
Upper bits.
rxosr[10:8]
stallctrl
Used for BCR Purposes.
NCO Offset.
ncoff[19:16]
3:0
See formula above.
98
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