STC3500 Datasheet, PDF (24/48 Pages) Connor-Winfield Corporation – INTEGRATED - STRATUM 3 TIMING SOURCE

Register Descriptions and Operation continued
History_Cmd, 0x26 (R/W)
Bit 7 ~ Bit 5
Reserved
Bit 1 ~ 0
Hold Over history commands
01: Save active history to backup history
10: Restore active history from backup
11: Flush the active history and
accumulated register
00: No command
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 ready by the application. A flush
does not affect the back up history. See Application Notes, Hold Over History Accumulation and Management section.
Hold Over_Time, 0x27 (R)
Bit 7 ~ Bit 0
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.
Cfgdata, 0x30 (R/W)
Configuration data write register
Bit 7 ~ Bit 0
Configuration data is written to this register. See Application Notes, Configuration Data section.
Cfgctr_Lo, 0x31 (R)
Configuration data write counter low byte
Bit 7 ~ Bit 0
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)
Configuration data write counter high byte
Bit 7 ~ Bit 0
High order byte of configuration data write counter. See Application Notes, Configuration Data section. Initialized to zero on
power-up/reset.
Preliminary Data Sheet: TM060 Page 24 of 48 Rev: P06 Date: 11/22/04
© Copyright 2001 The Connor-Winfield Corp. All Rights Reserved Specifications subject to change without notice