NEC 78K0 Series User Manual page 299

Remark If the overflow time is set to 2
Window close time
Window open time
<When window open period is 25%>
• Overflow time:
10
2 /f (MAX.) = 2
RL
• Window close time:
(MIN.) × (1 − 0.25) = 0 to 2
10
0 to 2 /f
RL
• Window open time:
(MIN.) × (1 − 0.25) to 2
10
2 /f
RL
= 3.56 to 3.88 ms
CHAPTER 11 WATCHDOG TIMER
10
/f , the window close time and open time are as follows.
RL
Setting of Window Open Period
25%
0 to 3.56 ms 0 to 2.37 ms
3.56 to 3.88 ms 2.37 to 3.88 ms
10
/264 kHz (MAX.) = 3.88 ms
/216 kHz (MIN.) × 0.75 = 0 to 3.56 ms
10
10
/f (MAX.) = 2
RL
Preliminary User's Manual U17260EJ3V1UD
50% 75%
0 to 0.119 ms
0.119 to 3.88 ms
/216 kHz (MIN.) × 0.75 to 2
10
100%
None
0 to 3.88 ms
10
/264 kHz (MAX.)
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