p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 339

• Manufacturer Part Number: p2125vps20
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

This LSI incorporates two watchdog timer channels (WDT_0 and WDT_1). The watchdog timer
is an 8-bit timer that can generate an internal reset signal or an internal NMI interrupt signal if a
system crash prevents the CPU from writing to the timer counter, thus allowing it to overflow.
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. A block
diagram of the WDT_0 and WDT_1 are shown in figure 14.1.
14.1
• Selectable from eight (WDT_0) or 16 (WDT_1) counter input clocks.
• Switchable between watchdog timer mode and interval timer mode
Watchdog Timer Mode:
•
Internal Timer Mode:
•
WDT0102A_000020020300
If the counter overflows, an internal reset or an internal NMI interrupt is generated.
If the counter overflows, an internal timer interrupt (WOVI) is generated.
Features
Section 14 Watchdog Timer (WDT)
Rev. 1.00 Sep. 21, 2006 Page 301 of 658
Section 14 Watchdog Timer (WDT)
REJ09B0310-0100