RFM42/43
Register 34h. Preamble Length
Bit
D7
D6
D5
D4
prealen[7:0]
R/w
D3
D2
D1
D0
Name
Type
Reset value = 00001000
Bit
Name
Function
prealen[7:0]
Preamble Length.
The value in the prealen[8:0] register corresponds to the number of nibbles (4
bits) in the packet. For example prealen[8:0] = ‗000001000‘ corresponds to a
preamble length of 32 bits (8 x 4bits) or 4 bytes. The maximum preamble length
is prealen[8:0] = 111111111 which corresponds to a 255 bytes Preamble.
Writing 0 will have the same result as if writing 1, which corresponds to one
single nibble of preamble.
7：0
Register 36h. Synchronization Word 3
Bit
D7
D6
D5
D4
D3
sync[31:24]
R/W
D2
D1
D0
Name
Type
Reset value = 00101101
Bit
Name
Function
Synchronization Word 3.
4th byte of the synchronization word.
7：0
sync[31:24]
Register 37h. Synchronization Word 2
Bit
D7
D6
D5
D4
D3
sync[23:16]
R/W
D2
D1
D0
Name
Type
Reset value = 11010100
Bit
Name
Function
Synchronization Word 2.
3rd byte of the synchronization word.
7：0
sync[23:16]
74
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