3069RF-ZTAT Datasheet, PDF (465/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

Bit 7—Overflow Flag (OVF): This status flag indicates that the timer counter has overflowed
from H'FF to H'00.
Bit 7
OVF
0
1
Description
[Clearing condition]
Cleared by reading OVF when OVF = 1, then writing 0 in OVF
[Setting condition]
Set when TCNT changes from H'FF to H'00
(Initial value)
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
0
1
Description
Interval timer: requests interval timer interrupts
Watchdog timer: generates a reset signal
(Initial value)
Bit 5—Timer Enable (TME): Selects whether TCNT runs or is halted. When WT/IT = 1, clear
the software standby bit (SSBY) to 0 in SYSCR before setting TME. When setting SSBY to 1,
TME should be cleared to 0.
Bit 5
TME
0
1
Description
TCNT is initialized to H'00 and halted
TCNT is counting
(Initial value)
Bits 4 and 3—Reserved: These bits cannot be modified and are always read as 1.
Rev. 5.0, 09/04, page 443 of 978