
MC80F0304/08/16
November 4, 2011 Ver 2.12
57
Figure 12-3 Watchdog timer Timing
If the watchdog timer output becomes active, a reset is generated,
which drives the RESET pin low to reset the internal hardware.
The main clock oscillator also turns on when a watchdog timer re-
set is generated in sub clock mode.
2
3
n
Source clock
Binary-counter
WDTR
WDTIF interrupt
WDTR
←
“1000_0011
B
”
1
0
Match
Detect
Counter
Clear
1
2
3
0
BIT overflow
3
WDT reset
reset
Counter
Clear