HD6412332 RENESAS [Renesas Technology Corp], HD6412332 Datasheet - Page 609

• Manufacturer Part Number: HD6412332
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

13.1
The chip has a single-channel on-chip watchdog timer (WDT) for monitoring system operation.
The WDT outputs an overflow signal (WDTOVF) if a system crash prevents the CPU from
writing to the timer counter, allowing it to overflow. At the same time, the WDT can also generate
an internal reset signal for the chip.
When this watchdog function is not needed, the WDT can be used as an interval timer. In interval
timer operation, an interval timer interrupt is generated each time the counter overflows.
13.1.1
WDT features are listed below.
• Switchable between watchdog timer mode and interval timer mode
• WDTOVF output when in watchdog timer mode
• Interrupt generation when in interval timer mode
• Choice of eight counter clock sources
If the counter overflows, the WDT outputs WDTOVF. It is possible to select whether or not
the entire chip is reset at the same time
If the counter overflows, the WDT generates an interval timer interrupt
Overview
Features
Section 13 Watchdog Timer
Rev.4.00 Sep. 07, 2007 Page 579 of 1210
REJ09B0245-0400