CHAPTER 9 WATCHDOG TIMER
176
User’s Manual U11302EJ4V0UM
Figure 9-1. Watchdog Timer Block Diagram
INTWDT
INTWDT
f
WDT
8-bit prescaler
Selector
8-bit counter
TCL22
TCL21
TCL20
Internal bus
Timer clock select register 2
Watchdog timer mode register
3
2
2
2
3
2
4
2
5
2
6
2
8
f
WDT
2
WDTM4
RUN
WDTM3
RUN
Controller
Internal bus
TMIF4
TMMK4
maskab
le interr
upt
request
non-maskab
le
interr
upt request
RESET
Selector
Clear
2
4
f
X
2
3
f
X
f
WDT
f
WDT
f
WDT
f
WDT
f
WDT
f
WDT