207
Bit 3: B2WI
Description
0
Writing to bit 2 is enabled
1
Writing to bit 2 is disabled
(initial value)
Bit 2—Watchdog Timer On (WDON): Bit 2 control watchdog timer operation.
The count-up starts when this bit is set to 1, and stops when it is cleared to 0.
Bit 2: WDON
Description
0
Watchdog timer operation disabled
(initial value)
[Clearing condition]
In a reset, or when 0 is written to WDON while writing 0 to B2WI when
TCSRWE is set to 1
1
Watchdog timer operation enabled
[Setting condition]
When 1 is written to WDON while writing 0 to B2WI when TCSRWE is set to
1
Bit 1—Bit 0 Write Inhibit (B0WI): Bit 1 controls writing of data to bit 0 of timer
control/status register W.
This bit is always read as 1. Data is not stored if written to this bit.
Bit 1: B0WI
Description
0
Writing to bit 0 is enabled
1
Writing to bit 0 is disabled
(initial value)
Bit 0—Watchdog Timer Reset (WRST): Bit 0 indicates that TCW has overflowed and an
internal reset signal has been generated. The internal reset signal generated by the overflow
resets the entire chip.
WRST is cleared by a reset via the
RES
pin or by a 0 write by software.