RFM22 Datasheet, PDF (132/150 Pages) –

RFM22
Register 6Bh. GFSK FIR Filter Coefficient Address
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
Reserved
firadd[2:0]
Type
R
R/W
Reset value = xxxxx000
Bit
Name
7:3
Reserved
2:0
firadd[2:0]
Function
Reserved.
GFSK FIR Filter Coefficient Look-up Table Address.
The address for Gaussian filter coefficients used in the TX path. The default
GFSK setting is for BT = 0.5. It is not needed to change or load the GFSK
Coefficients if BT = 0.5 is satisfactory for the system.
000: i_coe0 (Default = d1)
001: i_coe1 (Default = d3)
010: i_coe2 (Default = d6)
011: i_coe3 (Default = d10)
100: i_coe4 (Default = d15)
101: i_coe5 (Default = d19)
110: i_coe6 (Default = d20)
Register 6Ch. GFSK FIR Filter Coefficient Value
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
Reserved
firval[5:0]
Type
R/W
R/W
Reset value = xxxxx000
Bit
Name
7:6
Reserved
5:0
firval[5:0]
Function
Reserved.
FIR Coefficient Value in the lOok-up Table Addressed by the firadd[2:0].
The default coefficient can be read or modified.
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