SI514 Datasheet, PDF (22/36 Pages) Silicon Laboratories – ANY-FREQUENCY IC PROGRAMMABLE XO

Si514
Register 9.
Bit
7
6
5
4
3
2
1
0
Name
M_Int[8:3]
Type
R/W
R/W
R/W
Default
Varies
Bit
Name
Function
7:6
Reserved
5:0
M_Int[8:3] Integer part of feedback divider M that sets the output frequency. Frequency updates
take effect when M_Int[8:3] is written.
Register 10.
Bit
7
6
5
4
3
2
1
0
Name
HS_DIV[7:0]
Type
R/W
Default
Varies
Bit
Name
Function
7:0 HS_DIV[7:0] Integer divider that divides VCO frequency and provides output to LS_DIV. Follow the
large frequency change procedure when updating. The allowed values are even num-
bers in the range from 10 to 1022 (i.e., 10, 12, 14, 16, ...., 1022). The decimal value
represents the actual divide value (i.e. 12 means divide-by-12).
22
Rev. 1.0