r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 843

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

The watchdog timer (WDT) is an 8-bit timer that outputs an overflow signal (WDTOVF) if a
system crash prevents the CPU from writing to the timer counter, thus allowing it to overflow. At
the same time, the WDT can also generate an internal reset signal.
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.
The block diagram of the WDT is shown in figure 14.1.
14.1
•
•
Watchdog Timer Mode
•
Interval Timer Mode
•
the entire chip is reset at the same time.
Selectable from eight counter input clocks
Switchable between watchdog timer mode and interval timer mode
If the counter overflows, the WDT outputs WDTOVF. It is possible to select whether or not
If the counter overflows, the WDT generates an interval timer interrupt (WOVI).
Features
Section 14 Watchdog Timer (WDT)
Rev. 1.00 Sep. 19, 2008 Page 813 of 1342
Section 14 Watchdog Timer (WDT)
REJ09B0467-0100