NEC PD78F9488 Manuale Utente
CHAPTER 9 WATCHDOG TIMER
168
User’s Manual U15331EJ4V1UD
9.2 Watchdog Timer Configuration
The watchdog timer includes the following hardware.
Table 9-3. Configuration of Watchdog Timer
Item Configuration
Control registers
Watchdog timer clock selection register (WDCS)
Watchdog timer mode register (WDTM)
Watchdog timer mode register (WDTM)
Figure 9-1. Block Diagram of Watchdog Timer
Internal bus
Internal bus
Prescaler
Selector
Controller
f
X
2
6
f
X
2
8
f
X
2
10
3
7-bit counter
WDTIF
WDTMK
WDCS2 WDCS1 WDCS0
Watchdog timer clock selection register
(WDCS)
Watchdog timer mode register (WDTM)
Clear
WDTM4
RUN
WDTM3
INTWDT
Maskable
interrupt request
Maskable
interrupt request
RESET
INTWDT
Non-maskable
interrupt request
Non-maskable
interrupt request
f
X
2
4