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HD151TS207SS 데이터시트(PDF) 18 Page - Renesas Technology Corp

부품명 HD151TS207SS
상세설명  Mother Board Clock Generator for Intel P4 Chipset (Springdale)
PDF  38 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD151TS207SS 데이터시트(HTML) 18 Page - Renesas Technology Corp

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HD151TS207SS
Rev.1.00, Apr.25.2003, page 18 of 38
I
2C Controlled Register Bit Map (cont.)
Byte18 Control Register
Bit
Description
Contents
Type
Default
Note
7
VCO2 Frequency Control Bit7
R/W
0
6
VCO2 Frequency Control Bit6
R/W
0
5
VCO2 Frequency Control Bit5
R/W
0
4
VCO2 Frequency Control Bit4
These bits are 10MHz digit of
VCO2 frequency.
0000 = 0, 0001 = 1 …. 1001 = 9
R/W
0
3
VCO2 Frequency Control Bit3
R/W
0
2
VCO2 Frequency Control Bit2
R/W
0
1
VCO2 Frequency Control Bit1
R/W
0
0
VCO2 Frequency Control Bit0
These bits are 1MHz digit of
VCO2 frequency.
0000 = 0, 0001 = 1 …. 1001 = 9
R/W
0
See
Note
1
Note:
1. B17[3:0] and B18[7:0] must be written together (at writing B18) in every case.
How to set VCO2 frequency to 666 MHz.
0001
011
0
ON
Write
Byte17
6
0110
0110
Byte18
6
6
max 720
min 200
How to read actual frequency of VCO2 and CPU clock
0110
1000
Byte20
8
6
0110
0110
Byte17[4] = 1
Actual VCO2 freq. read back.
Byte19
6
6
Note:
Case of VCO2 = 666.8 MHz.
Other clock frequency are able to read using the same way as shown at upper.
Byte19, Byte20 = Read back of VCO2 actual frequency.
Byte21, Byte22 = Read back of CPU actual frequency.



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