Cypress Semiconductor CY25822-2 Технический паспорт - Страница 3
Просмотреть онлайн или скачать pdf Технический паспорт для Компьютерное оборудование Cypress Semiconductor CY25822-2. Cypress Semiconductor CY25822-2 9 страниц. Cypress spread spectrum clock generator specification sheet
Печатать страницуTable 2. Block Read and Block Write Protocol (continued)
....
Data Byte N –8 bits
....
Acknowledge from slave
....
Stop
Table 3. Byte Read and Byte Write Protocol
Byte Write Protocol
Bit
1
Start
2:8
Slave address – 7 bits
9
Write = 0
10
Acknowledge from slave
11:18
Command Code – 8 bits
'1xxxxxxx' stands for byte operation, bits[6:0] of
the command code represents the offset of the
byte to be accessed
19
Acknowledge from slave
20:27
Data byte from master – 8 bits
28
Acknowledge from slave
29
Stop
Byte 0: Control Register
Bit
@Pup
Pin#
7
1
4
6
0
4
5
0
4
4
0
4
3
1
2
1
4, 5
1
1
4
0
0
Table 4. Spread Spectrum Select
SS3
SS2
0
0
0
0
0
0
0
0
0
1
Document #: 38-07531 Rev. **
Description
Name
SS0
–
SS1
–
SS2
–
SS3
–
Not Applicable
Reserved, must be written as 1
CLKOUT,
Power-down three-state enable
REFOUT
0 = three-state outputs, 1 = drive outputs low
(Applies only in Power Down State)
CLKOUT
Spread Spectrum enable
0 = spread off, 1 = spread on
Not Applicable
No Pins
SS1
SS0
0
0
0
1
1
0
1
1
0
0
56
Acknowledge
....
Data bytes from slave/Acknowledge
....
Data byte N from slave – 8 bits
....
Not Acknowledge
....
Stop
Byte Read Protocol
Bit
1
Start
2:8
Slave address – 7 bits
9
Write = 0
10
Acknowledge from slave
11:18
Command Code – 8 bits
'1xxxxxxx' stands for byte operation, bits[6:0]
of the command code represents the offset of
the byte to be accessed
19
Acknowledge from slave
20
Repeat start
21:27
Slave address – 7 bits
28
Read = 1
29
Acknowledge from slave
30:37
Data byte from slave – 8 bits
38
Not Acknowledge
39
Stop
Pin Description
Spread Mode
Down
Down
Down
Down
Down
CY25822-2
Description
Spread Amount%
0.8
1.0
1.25
1.5
1.75
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