Rev. 1.0, 02/00, page 348 of 1141
17.1.2
Block Diagram
Figure 17.1 shows block diagram of WDT.
Overflow
Interrupt
control
•
Reset
control
WOVI
(Interrupt request signal)
Internal reset signal*
WTCNT
WTCSR
φ
/ 2
φ
/ 64
φ
/ 128
φ
/ 512
φ
/ 2048
φ
/ 8192
φ
/ 32768
φ
/ 131072
Clock
Clock
select
Internal clock
source
Bus
interface
Module bus
WTCSR
WTCNT
Note: * The internal reset signal can be generated by means of a register setting.
: Timer control/status register
: Timer counter
Internal bus
WDT
[Legend]
Internal NMI
interrupt request signal
Figure 17.1 Block Diagram of WDT