SM8702AM 查看數據表（PDF） - Nippon Precision Circuits
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SM8702AM Datasheet PDF : 16 Pages
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SM8702AM
I2C Bus Data Bytes
Byte 0: function and frequency select
Bit
Function
Power-ON
default
Notes
7
0: Spread spectrum ± 1.5% modulation
1: Spread spectrum ± 0.5% modulation
0
The spread spectrum accuracy of modulation is not
guaranteed.
Frequency select bits
Bit 6
Bit 5
Bit 4
CPUCLK
[MHz]
PCICLK
[MHz]
1
1
1
100.2
33.4
1
1
0
133
33.2
1
0
1
112.1
37.3
6:4
1
0
0
103
34.3
The pow er-ON default for bits 4 to 6 is 1.
1
When bit 3 is set to 1 (I2C select), bits 4 to 6 select
the frequency in the same write cycle timing.
0
1
1
66.5
33.2
0
1
0
83.3
41.6
0
0
1
74.9
37.4
0
0
0
94.7
31.6
3
0: Hardware frequency select using FS[0:2]
1: I2C bus serial data frequency select
2
0: Spread spectrum center spread select
1: Spread spectrum down spread select
1
0: Normal operating mode (SSCG disabled)
1: Spread spectrum operating mode (SSCG enabled)
0
0: Normal output mode (running)
1: Three-state output mode
0
FS[0:2] are latch inputs
0
0
0
All outputs are high impedance when bit 0 is set to 1.
Byte 1: CPU register
Bit
Pin Power-ON
number default1
Notes
7
26
1
48MHz USB
6
25
1
24MHz (Super I/O)
5
–
1
(Reserved)
4
–
1
(Reserved)
3
–
1
(Reserved)
2
–
1
(Reserved)
1
43
1
CPUCLK1 enable
0
44
1
CPUCLK0 enable
1. 1 = enabled, 0 = disabled
Byte 2: PCI register
Bit
Pin Power-ON
number default1
Notes
7
–
1
(Reserved)
6
7
1
PCICLK_F enable
5
–
1
(Reserved)
4
14
1
PCICLK4 enable
3
12
1
PCICLK3 enable
2
11
1
PCICLK2 enable
1
10
1
PCICLK1 enable
0
8
1
PCICLK0 enable
1. 1 = enabled, 0 = disabled
NIPPON PRECISION CIRCUITS—15
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