SI570 Datasheet, PDF (14/26 Pages) Silicon Laboratories – ANY-RATE I2C PROGRAMMABLE XO/VCXO

Si570/Si571
4. Serial Port Registers
Note: Any register not listed here is reserved and must not be written. All bits are R/W unless otherwise noted.
Register
Name
Bit 7
Bit 6
Bit 5
Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
7
High Speed/
N1 Dividers
HS_DIV[2:0]
N1[6:2]
8 Reference Frequency
N1[1:0]
RFREQ[37:32]
9 Reference Frequency
RFREQ[31:24]
10 Reference Frequency
RFREQ[23:16]
11 Reference Frequency
RFREQ[15:8]
12 Reference Frequency
RFREQ[7:0]
135 Reset/Memory Control RST_REG NewFreq
RECALL
137
Freeze DCO
Freeze DCO
14
Rev. 0.3