H8SLASH3021 datasheet(344/712 Pages) RENESAS

No. de pieza	H8/3021

Descripción Electrónicos	16-Bit Single-Chip Microcomputer

PDF	712 Pages

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Fabricante Electrónico	RENESAS [Renesas Technology Corp]

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10. Watchdog Timer

Rev.2.00 Mar. 22, 2007 Page 320 of 684

REJ09B0352-0200

Bit 7—Overflow Flag (OVF): This status flag indicates that the timer counter has overflowed

from H'FF to H'00.

Bit 7

OVF

Description

[Clearing condition]

Cleared by reading OVF when OVF = 1, then writing 0 in OVF

(Initial value)

[Setting condition]

Set when TCNT changes from H'FF to H'00

Bit 6—Timer Mode Select (WT/

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

interval timer. If used as an interval timer, the WDT generates an interval timer interrupt request

when TCNT overflows. If used as a watchdog timer, the WDT generates a reset signal when

TCNT overflows.

Bit 6

WT/

Description

Interval timer: requests interval timer interrupts

(Initial value)

Watchdog timer: generates a reset signal

Bit 5—Timer Enable (TME): Selects whether TCNT runs or is halted.

Bit 5

TME

Description

TCNT is initialized to H'00 and halted

(Initial value)

TCNT is counting

Bits 4 and 3—Reserved: These bits cannot be modified and are always read as 1.

H8/3021 Datasheet(PDF) 344 Page - Renesas Technology Corp