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RF68

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Table 9

TWI Instruction Table

Byte 0

Byte 1

Byte 2

7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0

Instruction

0 0 0 0

(0000)

DA(15:0)

Write Application bits

0 0 0 1 1

DF(18:0)

Write Frequency bits

0 0 1 0

(0)(0010)(0010)

DT(10:0)

Write Test bits (pad protected)

0 0 1 1

(0011)

DA(15:0)

Read Application bits

0 1 0 0

(0100)

DF(15:0)

Read the 16 least significant Frequency bits

0 1 0 1

(0101)

DS(12:5)

DS(4:0)

DF(18:

16)

Read Chip version, Status and 3 most significant

Frequency bits

0 1 1 0

(0110)

DS(28:13)

Read Bist signature

0 1 1 1

(0111)

(1111)(1)

DT(10:0)

Read Test bits

1

x

Discarded, not an instruction

All 1

Recovery instruction

Notes - The first “0” transmitted to the RF68 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