NEC switch - Manual (Page 92)

CHAPTER 7 WATCHDOG TIMER
User’s Manual U12978EJ3V0UD
92
7.2 Watchdog Timer Configuration
The watchdog timer consists of the following hardware.
Table 7-3. Configuration of Watchdog Timer
Item Configuration
Control register Timer clock select register 2 (TCL2)
Watchdog timer mode register (WDTM)
Figure 7-1. 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
Clear
TMIF4
TMMK4
TCL22 TCL21 TCL20
Timer clock select register 2
(TCL2) Watchdog timer mode register (WDTM)
WDTM4 WDTM3
INTWDT
maskable
interrupt request
RESET
INTWDT
non-maskable
interrupt request
f X
2 4
RUN