R01UH0822EJ0100 Rev.1.00
Page 575 of 1041
Jul 31, 2019
RX13T Group
22. Independent Watchdog Timer (IWDTa)
Figure 22.4
Operation Example in Auto-Start Mode
Refresh-
prohibited period
Refresh-
prohibited period
Refresh-
permitted period
Status flag
cleared
Status flag
cleared
Counter value
100%
75%
50%
25%
0%
RES# pin
Refresh
the counter
(active high)
REFEF flag
UNDFF flag
Reset output
from IWDT
(active high)
H
L
H
L
L
Refresh error
Refresh error
Counting starts
Counting starts
Underflow
Counting starts
Counting starts
Interrupt request
(WUNI)
(active low)