
312
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
0
[Clearing condition]
Cleared by reading OVF when OVF = 1, then writing 0 in OVF
(Initial value)
1
[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/
IT
Description
0
Interval timer: requests interval timer interrupts
(Initial value)
1
Watchdog timer: generates a reset signal
Bit 5—Timer Enable (TME): Selects whether TCNT runs or is halted.
Bit 5
TME
Description
0
TCNT is initialized to H'00 and halted
(Initial value)
1
TCNT is counting
Bits 4 and 3—Reserved: These bits cannot be modified and are always read as 1.