Hitachi H8S/2646 Hardware Manual page 458

TCNT value
H'FF
H'00
WT/IT= 1
TME= 1
Internal
reset signal
Legend
: Timer mode select bit
WT/IT
: Timer enable bit
TME
Note: * The WOVF bit is set to 1 and then cleared to 0 by an internal reset.
426
Write H'00'
to TCNT
Figure 12-4 (b) WDT1 Watchdog Timer Operation
Overflow
WT/IT= 1
WOVF= 1*
TME= 1
internal reset
is generated
515/516 states
Time
Write H'00'
to TCNT