NEC mPD780065 Series Preliminary User's Manual page 162

(1) Watchdog timer mode
A runaway is detected. Upon detection of the runaway, a non-maskable interrupt request or RESET can be
generated.
Remarks 1. f : Main system clock oscillation frequency
X
2. Figures in parentheses are for operation with f
(2) Interval timer mode
Interrupt requests are generated at the preset time intervals.
Remarks 1. f : Main system clock oscillation frequency
X
2. Figures in parentheses are for operation with f
162
CHAPTER 9 WATCHDOG TIMER
Table 9-1. Watchdog Timer Runaway Detection Times
Runaway Detection Times
× 1/f (489 µ s)
12
2
X
× 1/f (978 µ s)
13
2
X
× 1/f
14
2 (1.96 ms)
X
× 1/f
15
2 (3.91 ms)
X
× 1/f
16
2 (7.82 ms)
X
× 1/f
17
2 (15.6 ms)
X
× 1/f
18
2 (31.3 ms)
X
× 1/f
20
2 (125 ms)
X
Table 9-2. Interval Times
Interval Time
(489 µ s)
× 1/f
12
2
X
× 1/f (978 µ s)
13
2
X
× 1/f
14
2 (1.96 ms)
X
× 1/f
15
2 (3.91 ms)
X
× 1/f
16
2 (7.82 ms)
X
× 1/f
17
2 (15.6 ms)
X
× 1/f
18
2 (31.3 ms)
X
× 1/f
20
2 (125 ms)
X
Preliminary User's Manual U13420EJ2V0UM00
= 8.38 MHz
X
= 8.38 MHz
X