CY28435
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
Description
Bit
1
Description
Bit
1
Start
Start
8:2
9
Slave address – 7 bits
Write
8:2
9
Slave address – 7 bits
Write
10
Acknowledge from slave
Command Code – 8 bits
Acknowledge from slave
10
Acknowledge from slave
Command Code – 8 bits
Acknowledge from slave
Repeat start
18:11
19
18:11
19
27:20
Byte Count – 8 bits
(Skip this step if I2C_EN bit set)
20
28
36:29
37
Acknowledge from slave
Data byte 1 – 8 bits
27:21
28
Slave address – 7 bits
Read = 1
Acknowledge from slave
Data byte 2 – 8 bits
29
Acknowledge from slave
Byte Count from slave – 8 bits
Acknowledge
45:38
46
37:30
38
Acknowledge from slave
Data Byte/Slave Acknowledges
Data Byte N – 8 bits
Acknowledge from slave
Stop
....
46:39
47
Data byte 1 from slave – 8 bits
Acknowledge
....
....
55:48
56
Data byte 2 from slave – 8 bits
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
Description
Bit
1
Description
Bit
1
Start
Start
8:2
9
Slave address – 7 bits
Write
8:2
9
Slave address – 7 bits
Write
10
Acknowledge from slave
Command Code – 8 bits
Acknowledge from slave
Data byte – 8 bits
Acknowledge from slave
Stop
10
Acknowledge from slave
Command Code – 8 bits
Acknowledge from slave
Repeated start
18:11
19
18:11
19
27:20
28
20
27:21
28
Slave address – 7 bits
Read
29
29
Acknowledge from slave
Data from slave – 8 bits
NOT Acknowledge
Stop
37:30
38
39
Rev 1.0,November 20, 2006
Page 4 of 22
SPECTRALINEAR [ SPECTRALINEAR INC ]
