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HD151TS207SS
Rev.1.00, Apr.25.2003, page 18 of 38
I
2
C 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.
00010110
ON
Write
Byte17
6
01100110
Byte18
66
max 720
min 200
How to read actual frequency of VCO2 and CPU clock
01101000
Byte20
86
01100110
Byte17[4] = 1
Actual VCO2 freq. read back.
Byte19
66
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.