Overview - Fujitsu 8FX Hardware Manual

CHAPTER 17 CLOCK SUPERVISOR COUNTER

17.1 Overview

17.1 Overview
The clock supervisor counter checks the external clock frequency to detect the
abnormal state of the external clock.
■ Overview of Clock Supervisor Counter
The clock supervisor counter checks the external clock frequency to detect the abnormal state
of the external clock.
The clock supervisor counter automatically counts up the counter based on the external clock
input within the time-base timer interval time selected from eight options.
The main oscillation clock or the suboscillation clock can be selected as the count clock of this
module.
Note:
Operate the clock supervisor counter in main CR clock mode together with the hardware
watchdog timer (running in standby mode).
Otherwise, it cannot detect the abnormal state of the external clock correctly and will
hang up if the external clock stops.
See "CHAPTER 8 HARDWARE/SOFTWARE WATCHDOG TIMER" for the hardware
watchdog timer (running in standby mode).
290 FUJITSU SEMICONDUCTOR LIMITED
MB95630H Series
MN702-00009-2v0-E