SH7708 datasheet(197/633 Pages) RENESAS

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179

Bit 6—Timer Mode Select (WT/

IT): Selects whether to use the WDT as a watchdog timer or an

interval timer.

Bit 6: WT/

Description

Use as interval timer

(Initial value)

Use as watchdog timer

Note:

If WT/

IT is modified when the WDT is running, the up-count may not be performed correctly.

Bit 5—Reset Select (RSTS): Selects the type of reset when the WTCNT overflows in watchdog

timer mode. In interval timer mode, this setting is ignored.

Bit 5: RSTS

Description

Power-on reset

(Initial value)

Manual reset

Bit 4—Watchdog Timer Overflow (WOVF): Indicates that the WTCNT has overflowed in

watchdog timer mode. This bit is not set in interval timer mode.

Bit 4: WOVF

Description

No overflow

(Initial value)

WTCNT has overflowed in watchdog timer mode

Bit 3—Interval Timer Overflow (IOVF): Indicates that the WTCNT has overflowed in interval

timer mode. This bit is not set in watchdog timer mode.

Bit 3: IOVF

Description

No overflow

(Initial value)

WTCNT has overflowed in interval timer mode

Bits 2 to 0—Clock Select 2–0 (CKS2–CKS0): These bits select the clock to be used for the

WTCNT count from the eight types obtainable by dividing the peripheral clock. The overflow

period in the table is the value when the peripheral clock (P

φ) is 15 MHz.

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