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HD151TS207SS
2
I
C Controlled Register Bit Map (cont.)
Byte18 Control Register
Bit
Description
7
VCO2 Frequency Control Bit7
6
VCO2 Frequency Control Bit6
5
VCO2 Frequency Control Bit5
4
VCO2 Frequency Control Bit4
3
VCO2 Frequency Control Bit3
2
VCO2 Frequency Control Bit2
1
VCO2 Frequency Control Bit1
0
VCO2 Frequency Control Bit0
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.
Write
Byte17
0
0
0
1
0
ON
How to read actual frequency of VCO2 and CPU clock
Byte17[4] = 1
Actual VCO2 freq. read back.
Byte19
0
1
1
0
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.
Rev.1.00, Apr.25.2003, page 18 of 38
Contents
These bits are 10MHz digit of
VCO2 frequency.
0000 = 0, 0001 = 1 .... 1001 = 9
These bits are 1MHz digit of
VCO2 frequency.
0000 = 0, 0001 = 1 .... 1001 = 9
1
1
0
6
0
1
1
0
6
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Byte18
0
1
1
0
6
Byte20
0
1
1
0
6
Default
Note
0
See
Note
0
1
0
0
0
0
0
0
0
1
1
0
6
max 720
min 200
1
0
0
0
8
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