236
H'F8
TCW overflow
Start
H'F8 written
in TCW
H'F8 written in TCW
Reset
Internal reset
signal
512 ø
OSC
clock cycles
H'FF
H'00
TCW count
value
Figure 9.17 Typical Watchdog Timer Operations (Example)
9.6.4
Watchdog Timer Operation States
Table 9.18 summarizes the watchdog timer operation states.
Table 9.18 Watchdog Timer Operation States
Operation Mode
Reset
Active
Sleep
Watch
Sub-
active
Sub-
sleep
Standby
Module
Standby
TCW
Reset
Functions Functions Halted
Functions/
Halted
*
Halted
Halted
Halted
TCSRW
Reset
Functions Functions Retained
Functions/
Halted
*
Retained
Retained
Retained
Note:
*
Functions when øw/32 is selected as the input clock.