stc3800 Connor-Winfield VCXOs, stc3800 Datasheet - Page 24

• Manufacturer Part Number: stc3800
• Description: Integrated - Stratum 3e Timing Source
• Manufacturer: Connor-Winfield VCXOs

Register Descriptions and Operation continued
History_Cmd, 0x26 (R/W)
Bits 0-1 are written to save a Hold Over history to the backup history, restore the active Hold Over history from the backup, or flush
the active history. The default value of the register is 00. The last command is latched and may be read by the application. A flush
does not affect the backup history. See Application Notes, Holdover History Accumulation and Management section.
Hold Over_Time, 0x27 (R)
Cfgdata, 0x30 (R/W)
Configuration data is written to this register. See Application Notes, Configuration Data section.
Cfgctr_Lo, 0x31 (R)
Low order byte of configuration data write counter. See Application Notes, Configuration Data section. Initialized to zero on
power-up/reset.
Cfgctr_Hi, 0x32 (R)
High order byte of configuration data write counter. See Application Notes, Configuration Data section. Initialized to zero on
power-up/reset.
Reserved
Indicates the time since entering the Hold Over state. From 0 to 255, one bit per hour. Zero in non-Hold Over state, stops at 255.
Configuration data write register
Configuration data write counter low byte
Configuration data write counter high byte
Bit 7 ~ Bit 2
© Copyright 2001 The Connor-Winfield Corp. All Rights Reserved
Preliminary Data Sheet #: TM061
Bit 7 ~ Bit 0
Bit 7 ~ Bit 0
Bit 7 ~ Bit 0
Bit 7 ~ Bit 0
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Hold Over history commands
01: Save active history to backup history
10: Restore active history from backup
11: Flush the active history and reset the
00: No command
Bit 1 ~ 0
Specifications subject to change without notice
accumulated register
Rev: P06
Date: 11/22/04