f
X
8-Bit Prescaler
2
4
f
f
f
f
f
X
X
X
X
X
2
5
2
6
2
7
2
8
2
9
Timer Clock Select Register 2
Figure 11-1. Watchdog Timer Block Diagram
f
f
X
X
RUN
2
10
2
12
Clear
8-Bit Counter
3
TCL22
TCL21 TCL20
Internal Bus
Internal Bus
TMMK4
TMIF4
Control
Circuit
RUN
WDTM4
WDTM3
Watchdog Timer Mode Register
INTWDT
Maskable Interrupt
Request
RESET
INTWDT
Non-Maskable
Interrupt Request