CY28344 Cypress Semiconductor, CY28344 Datasheet - Page 5

• Manufacturer Part Number: CY28344
• Description: FTG
• Manufacturer: Cypress Semiconductor

Table 3. Byte Read and Byte Write Protocol
Data Byte Configuration Map
Data Byte 0
Data Byte 1
Document #: 38-07113, Rev. *A
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
20:27
11:18
Bit
Bit
Bit
2:8
10
19
28
29
1
9
40, 39
44, 43
47, 46
Start
Slave address – 7 bit
Write
Acknowledge from slave
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
Acknowledge from slave
Data byte – 8 bits
Acknowledge from slave
Stop
Pin#
Pin#
--
--
--
--
--
--
--
--
--
--
--
--
--
Byte Write Protocol
SEL3
SEL2
SEL1
SEL0
FS_Override
SEL4
Spread Spectrum Enable
Reserved
CPU2, CPU2#
CPU1, CPU1#
CPU0, CPU0#
Latched FS4 input
Latched FS3 input
Latched FS2 input
Latched FS1 input
Latched FS0 input
Description
Name
Name
PRELIMINARY
SW Frequency selection bits. See Table 4.
0 = Select operating frequency by FS[4:0] input pins
1 = Select operating frequency by SEL[4:0] settings
SW Frequency selection bits. See Table 4.
0 = OFF; 1 = Enabled
Reserved
(Active/Inactive)
(Active/Inactive)
(Active/Inactive)
Latched FS[4:0] inputs. These bits are Read-only.
11:18
21:27
30:37
2:8
Bit
10
19
20
28
29
38
39
1
9
Start
Slave address – 7 bit
Write
Acknowledge from slave
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
Acknowledge from slave
Repeat start
Slave address – 7 bits
Read
Acknowledge from slave
Data byte from slave – 8 bits
Not acknowledge
Stop
Description
Description
Byte Read Protocol
Description
CY28344
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Power On
Power On
Default
Default
0
0
0
0
0
0
0
0
1
1
1
X
X
X
X
X