RFM68CW
RFM68CW
Table 9 TWI Instruction Table
Byte 0
Byte 1
Byte 2
Instruction
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
0 0 0 0
0 0 0 1 1
0 0 1 0
0 0 1 1
0 1 0 0
0 1 0 1
(0000)
DA(15:0)
DF(18:0)
Write Application bits
Write Frequency bits
(0)(0010)(0010)
DT(10:0)
Write Test bits (pad protected)
Read Application bits
(0011)
(0100)
(0101)
DA(15:0)
DF(15:0)
Read the 16 least significant Frequency bits
DS(12:5)
DS(4:0)
DF(18: Read Chip version, Status and 3 most significant
16)
Frequency bits
0 1 1 0
0 1 1 1
1
(0110)
(0111)
DS(28:13)
DT(10:0)
Read Bist signature
Read Test bits
(1111)(1)
x
Discarded, not an instruction
Recovery instruction
All 1
Notes
- The first “0” transmitted to the RFM68CW is required to initialize communication
- The following 3 bits (highlighted in blue) determine the type of instruction
- The forthcoming bits (highlighted in green) define a protection pattern; any error in these bits voids the instruction
13
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