NEC NEC PD78081(A), User Manual

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105
CHAPTER 7 WATCHDOG TIMER
Prescaler
f
XX
2
4
f
XX
2
5
f
XX
2
6
f
XX
2
7
f
XX
2
8
f
XX
2
9
Selector
Watchdog Timer Mode Register
Internal Bus
Internal Bus
TCL22 TCL21 TCL20
f
XX
/2
3
f
XX
2
11
Timer Clock Select Register 2
3
WDTM4 WDTM3
8-Bit Counter
TMMK4
RUN
TMIF4
INTWDT
Maskable
Interrupt
Request
INTWDT
Non-Maskable
Interrupt
Request
RESET
Control
Circuit
7.2 Watchdog Timer Configuration
The watchdog timer consists of the following hardware.
Table 7-3. Watchdog Timer Configuration
Item Configuration
Timer clock select register 2 (TCL2)
Watchdog timer mode register (WDTM)
Figure 7-1. Watchdog Timer Block Diagram
Control register