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W305B
........................ Document #: 38-07262 Rev. *B Page 6 of 20
...
Data Byte N – 8 bits
47
Acknowledge
...
Acknowledge from slave
48:55
Data byte from slave – 8 bits
...
Stop
56
Acknowledge
...
Data bytes from slave/Acknowledge
...
Data byte N from slave – 8 bits
...
Not Acknowledge
...
Stop
Table 2. Block Read and Block Write Protocol (continued)
Block Write Protocol
Block Read Protocol
Bit
Description
Bit
Description
Table 3. Word Read and Word Write Protocol
Word Write Protocol
Word Read Protocol
Bit
Description
Bit
Description
1Start
2:8
Slave address – 7 bit
2:8
Slave address – 7 bit
9Write
10
Acknowledge from slave
10
Acknowledge from slave
11:18
Command Code – 8 bit
‘1xxxxxxx’ stands for byte or word operation
bit[6:0] of the command code represents the offset
of the byte to be accessed
11:18
Command Code – 8 bit
‘1xxxxxxx’ stands for byte or word operation
bit[6:0] of the command code represents the offset
of the byte to be accessed
19
Acknowledge from slave
19
Acknowledge from slave
20:27
Data byte low– 8 bits
20
Repeat start
28
Acknowledge from slave
21:27
Slave address – 7 bits
29:36
Data byte high – 8 bits
28
Read
37
Acknowledge from slave
29
Acknowledge from slave
38
Stop
30:37
Data byte low from slave – 8 bits
38
Acknowledge
39:46
Data byte high from slave – 8 bits
47
NOT acknowledge
48
Stop
Table 4. Byte Read and Byte Write Protocol
Byte Write Protocol
Byte Read Protocol
Bit
Description
Bit
Description
1Start
2:8
Slave address – 7 bit
2:8
Slave address – 7 bit
9Write
10
Acknowledge from slave
10
Acknowledge from slave
11:18
Command Code – 8 bit
‘1xxxxxxx’ stands for byte operation
bit[6:0] of the command code represents the offset
of the byte to be accessed
11:18
Command Code – 8 bit
‘1xxxxxxx’ stands for byte operation
bit[6:0] of the command code represents the offset
of the byte to be accessed
19
Acknowledge from slave
19
Acknowledge from slave
20:27
Data byte – 8 bits
20
Repeat start
28
Acknowledge from slave
21:27
Slave address – 7 bits
29
Stop
28
Read
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