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PRELIMINARY
CY28439
Document #: 38-07668 Rev. *D
Page 4 of 22
Table 1. Command Code Definition
Bit
Description
7
0 = Block read or block write operation, 1 = Byte read or byte write operation
(6:0)
Byte offset for byte read or byte write operation. For block read or block write operations, these bits should be '0000000'
Table 2. Block Read and Block Write Protocol
Block Write Protocol
Block Read Protocol
Bit
Description
Bit
Description
1
Start
1
Start
8:2
Slave address – 7 bits
8:2
Slave address – 7 bits
9
Write
9
Write
10
Acknowledge from slave
10
Acknowledge from slave
18:11
Command Code – 8 bits
18:11
Command Code – 8 bits
19
Acknowledge from slave
19
Acknowledge from slave
27:20
Byte Count – 8 bits
(Skip this step if I2C_EN bit set)
20
Repeat start
28
Acknowledge from slave
27:21
Slave address – 7 bits
36:29
Data byte 1 – 8 bits
28
Read = 1
37
Acknowledge from slave
29
Acknowledge from slave
45:38
Data byte 2 – 8 bits
37:30
Byte Count from slave – 8 bits
46
Acknowledge from slave
38
Acknowledge
....
Data Byte /Slave Acknowledges
46:39
Data byte 1 from slave – 8 bits
....
Data Byte N – 8 bits
47
Acknowledge
....
Acknowledge from slave
55:48
Data byte 2 from slave – 8 bits
....
Stop
56
Acknowledge
....
Data bytes from slave / Acknowledge
....
Data Byte N from slave – 8 bits
....
NOT Acknowledge
....
Stop
Table 3. Byte Read and Byte Write Protocol
Byte Write Protocol
Byte Read Protocol
Bit
Description
Bit
Description
1Start
1Start
8:2
Slave address – 7 bits
8:2
Slave address – 7 bits
9Write
9Write
10
Acknowledge from slave
10
Acknowledge from slave
18:11
Command Code – 8 bits
18:11
Command Code – 8 bits
19
Acknowledge from slave
19
Acknowledge from slave
27:20
Data byte – 8 bits
20
Repeated start
28
Acknowledge from slave
27:21
Slave address – 7 bits
29
Stop
28
Read
29
Acknowledge from slave
37:30
Data from slave – 8 bits
38
NOT Acknowledge
39
Stop