H8SLASH3028F datasheet(476/923 Pages) RENESAS

Part #	H8/3028F

Description	Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

PDF	923 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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476 / 923 page

Rev. 2.00, 09/03, page 446 of 890

12.3.2

Interval Timer Operation

Figure 12.5 illustrates interval timer operation. To use the WDT as an interval timer, clear bit

WT/

IT to 0 and set bit TME to 1 in TCSR. An interval timer interrupt request is generated at each

TCNT overflow. This function can be used to generate interval timer interrupts at regular

intervals.

TCNT

count value

Time t

Interval

timer

interrupt

Interval

timer

interrupt

Interval

timer

interrupt

Interval

timer

interrupt

WT/

= 0

TME = 1

H'FF

H'00

Figure 12.5 Interval Timer Operation

12.3.3

Timing of Setting of Overflow Flag (OVF)

Figure 12.6 shows the timing of setting of the OVF flag. The OVF flag is set to 1 when TCNT

overflows. At the same time, a reset signal is generated in watchdog timer operation, or an interval

timer interrupt is generated in interval timer operation.

TCNT

Overflow signal

OVF

H'FF

H'00

Figure 12.6 Timing of Setting of OVF

H8/3028F Datasheet(PDF) 476 Page - Renesas Technology Corp