HD64F2149YV datasheet(447/1075 Pages) RENESAS

Part #	HD64F2149YV

Description	Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

PDF	1075 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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Section 14 Watchdog Timer (WDT)

Rev. 3.00 Jan 18, 2006 page 419 of 1044

REJ09B0280-0300

TCNT value

H'00

Time

H'FF

WT/

IT = 1

TME = 1

H'00 written

to TCNT

WT/

IT = 1

TME = 1

H'00 written

to TCNT

518 system

clock periods

Internal reset signal

Overflow

RESO and internal

reset generated

OVF = 1*

RESO signal

WT/

IT: Timer mode select bit

TME:

Timer enable bit

OVF:

Overflow flag

Note: * Cleared to 0 by an internal reset when OVF is set to 1. XRST is cleared to 0.

132 system

clock periods

Figure 14.3 Operation in Watchdog Timer Mode (RST/

NMI

NMI = 1)

14.3.2

Interval Timer Operation

To use the WDT as an interval timer, clear the WT/

IT bit in TCSR to 0 and set the TME bit to 1.

An interval timer interrupt (WOVI) is generated each time TCNT overflows, provided that the

WDT is operating as an interval timer, as shown in figure 14.4. This function can be used to

generate interrupt requests at regular intervals.

HD64F2149YV Datasheet(PDF) 447 Page - Renesas Technology Corp

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