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R01UH0336EJ0102 Rev.1.02
Page 391 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 12 Window Watchdog Timer A (WDTA)
The following figure shows the reset or NMI request generation when the
counter overflows.
Figure 12-3
Timing Diagram of WDTA NMI Request or Reset Generation
The timing diagram above shows the following.
1. After reset release, the counter value remains 0000
H
until the first trigger is
generated.
2. WDTAnMD should be written before the first trigger is generated. However,
the settings are not applied immediately.
3. The counter starts at the first trigger.
The overflow value and other settings specified in WDTAnMD are applied.
4. When the counter overflows, an error is detected. Depending on the error
mode, either interrupt request WDTAnTNMI or reset WDTAnTRES is
generated.
The counter value remains until the system reset is performed.
5. When the system is reset, the counter is cleared.
FFFFH
(1)
(3)
(4)
(1)
(5)
(2)
Counter value
WDTAnTRES
or WDTAnTNMI
Reset
release
First
trigger
Error
detection
System
reset
Reset
release
WDTAnMD
write
Overflow value
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