Section 13 Watchdog Timer; Overview; Features - Hitachi H8/500 Series Hardware Manual

Section 13 Watchdog Timer

13.1 Overview

The H8/532 has an on-chip watchdog timer (WDT) module. This module can monitor system
operation by requesting a nonmaskable interrupt if a system crash allows the timer count to
overflow.
When this watchdog function is not needed, the WDT module can be used as an interval timer. In
the interval timer mode, an IRQ interrupt is requested at each counter overflow.
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The WDT module is also used in recovering from the software standby mode.

13.1.1 Features

The basic features of the watchdog timer module are summarized as follows:
• Selection of eight clock sources
• Selection of two modes: watchdog timer mode and interval timer mode
• Counter overflow generates an interrupt request
NMI request in the watchdog timer mode; IRQ request in the interval timer mode.
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