HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 423

• Manufacturer Part Number: HD6417144
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

The watchdog timer (WDT) is an 8-bit timer that can reset this LSI internally if the counter
overflows without rewriting the counter value due to a system crash or the like.
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 12.1.
12.1
• Switchable between watchdog timer mode and interval timer mode
In watchdog timer mode
• Output WDTOVF signal
In interval timer mode
• If the counter overflows, the WDT generates an interval timer interrupt (ITI).
• Clears software standby mode
• Selectable from eight counter input clocks.
WDT0400A_030020030800
If the counter overflows, it is possible to select whether this LSI is internally reset or not. A
power-on reset or manual reset can be selected as an in internal reset.
Features
Section 12 Watchdog Timer
Rev.4.00 Mar. 27, 2008 Page 379 of 882
12. Watchdog Timer
REJ09B0108-0400