10.7
Overview of Watchdog Timer
10.7.1 Block Diagram
Figure 10.2 shows a block diagram of the WDT.
WDT
Standby
mode
Standby
release
Standby
control
Frequency
divider 2 ×1
clock
Internal reset
request
Frequency divider
Reset
control
Clock selection
Overflow
Clock selector
Clock
Interrupt
request
Interrupt
control
WTCSR
WTCNT
Bus interface
WTCSR: Watchdog timer control/status register
WTCNT: Watchdog timer counter
Figure 10.2 Block Diagram of WDT
Rev. 6.0, 07/02, page 259 of 986