SI570 Datasheet, PDF (17/26 Pages) Silicon Laboratories – ANY-RATE I2C PROGRAMMABLE XO/VCXO

Si570/Si571
Register 12. Reference Frequency
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
RFREQ[7:0]
Type
R/W
Bit
Name
7:0 RFREQ[7:0] Reference Frequency.
Frequency control input to DCO.
Function
Register 135. Reset/Memory Control
Bit
D7
D6
D5
D4
Name RST_REG NewFreq
Type
R/W
R/W
D3
D2
N/A
R/W
D1
D0
RECALL
R/W
Reset settings = 00xx xx00
Bit
Name
Function
7
RST_REG Internal Reset.
0 = Normal operation.
1 = Reset of all internal logic. Output tristated during reset.
Upon completion of internal logic reset, RST_REG is internally reset to zero.
6
NewFreq New frequency applied.
Alerts the DSPLL that a new frequency configuration has been applied. This bit will
clear itself when the new frequency is applied.
5:1
N/A
Always zero.
0
RECALL Recall NVM into RAM.
0 = No operation.
1 = Write NVM bits into RAM. Bit is internally reset following completion of operation.
Rev. 0.3
17