RFM22
Register 6Bh. GFSK FIR Filter Coefficient Address
Bit
D7
D6
D5
Reserved
R
D4
D3
D2
D1
firadd[2:0]
R/W
D0
Name
Type
Reset value = xxxxx000
Bit
Name
Function
7:3
Reserved
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:
001:
010:
011:
100:
101:
110:
i_coe0 (Default = d1)
i_coe1 (Default = d3)
i_coe2 (Default = d6)
i_coe3 (Default = d10)
i_coe4 (Default = d15)
i_coe5 (Default = d19)
i_coe6 (Default = d20)
2:0
firadd[2:0]
Register 6Ch. GFSK FIR Filter Coefficient Value
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Reserved
R/W
firval[5:0]
R/W
Name
Type
Reset value = xxxxx000
Bit
Name
Function
7:6
Reserved
Reserved.
FIR Coefficient Value in the lOok-up Table Addressed by the firadd[2:0].
5:0
firval[5:0]
The default coefficient can be read or modified.
132
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