Data Sheet

NUC123
May 3, 2017 Page 58 of 99 Rev.2.04
NUC123 SERIES DATASHEET
Window Watchdog Timer (WWDT) 6.10
6.10.1 Overview
The Window Watchdog Timer is used to perform a system reset within a specified window period to
prevent software run to uncontrollable status by any unpredictable condition. The 6-bit down counter
value will stop to update when chip is in Idle or Power-down mode.
6.10.2 Features
 6-bit down counter value WWDTCVAL (WWDTCVR[5:0]) and 6-bit compare value WINCMP
(WWDTCR[21:16]) to make the WWDT time-out window period flexible
 Supports 4-bit value PERIODSEL (WWDTCR[11:8]) to programmable maximum 11-bit
prescale counter period of WWDT counter