H8SXSLASH1663M datasheet(887/1504 Pages) RENESAS

Part #	H8SX/1663M

Description	Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series

PDF	1504 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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Section 18 Watchdog Timer (WDT)

Rev. 2.00 Sep. 24, 2008 Page 855 of 1468

REJ09B0412-0200

Section 18 Watchdog Timer (WDT)

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.

Figure 18.1 shows a block diagram of the WDT.

18.1

Features

• Selectable from eight counter input clocks

• Switchable between watchdog timer mode and interval timer mode

 In watchdog timer mode

If the counter overflows, the WDT outputs

WDTOVF. It is possible to select whether or

not the entire LSI is reset at the same time.

 In interval timer mode

If the counter overflows, the WDT generates an interval timer interrupt (WOVI).

H8SX/1663M Datasheet(PDF) 887 Page - Renesas Technology Corp