HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 362

• Manufacturer Part Number: HD6413008F
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
• Manufacturer: RENESAS [Renesas Technology Corp]

11. Watchdog Timer
11.3.2
Figure 11.5 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.
11.3.3
Figure 11.6 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.
Rev.4.00 Aug. 20, 2007 Page 318 of 638
REJ09B0395-0400
H'FF
TCNT
count value
H'00
φ
TCNT
Overflow signal
OVF
Interval Timer Operation
Timing of Setting of Overflow Flag (OVF)
WT/
TME = 1
IT
= 0
Interval
timer
interrupt
Figure 11.5 Interval Timer Operation
Figure 11.6 Timing of Setting of OVF
H'FF
Interval
timer
interrupt
H'00
Interval
timer
interrupt
Interval
timer
interrupt
Time t