STC5455 Datasheet, PDF (36/56 Pages) Connor-Winfield Corporation – Synchronous Clock for SETS

When manual reference selection mode is selected:
STC5455
Synchronous Clock for SETS
Data sheet
Selects the reference or set to freerun/holdover/pseudo-holdover.
Bit 3 ~ Bit 0
0
1~5
6 ~ 12
13
14
15
Selection
Freerun
Sync with Ref 1 ~ Ref 5
Reserved
Holdover
Pseudo-Holdover
Reserved (for T0); Lock to T0 (for T4)
When hard-wired manual reference selection mode is selected:
The register is read only and indicates the current reference defined by pin SRCSW and the register Hard-
wired_Switch_Pre_Selection.
Default value: 0
Selected_Ref, 0x24 (R)
Address
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
0x24
Not used
Current selected reference
Indicates the current selected reference or operation mode.
Field Value
0
1~5
6 ~ 12
13
14
15
Current selected reference
Freerun
Sync with Ref 1 ~ Ref 5
Reserved
Holdover
Pseudo-Holdover
Reserved (for T0); Lock to T0 (for T4)
Device_Holdover_History, 0x25 (R)
Address
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
0x25
Bits 0 - 7 of 32 bit Device Holdover History
0x26
Bits 8 - 15 of 32 bit Device Holdover History
0x27
0x28
Bits 16 - 23 of 32 bit Device Holdover History
Bits 24 - 31 of 32 bit Device Holdover History
The accumulated device holdover history relative to MCLK. 2’s complement. Resolution is 0.745x10^-3 ppb.
Preliminary
Page 36 of 56 TM121
Rev:P1.3
© Copyright the Connor-Winfield Corp. All Rights Reserved Specifications subject to change without notice
Date: October 24, 2011