Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 13 FUNCTIONS OF WATCHDOG TIMER 2
R01UH0042EJ0500 Rev.5.00 Page 667 of 1513
Aug 12, 2011
CHAPTER 13 FUNCTIONS OF WATCHDOG TIMER 2
13.1 Functions
Watchdog timer 2 has the following functions.
• Default-start watchdog timer
Note 1
→ Reset mode: Reset operation upon overflow of watchdog timer 2 (generation of WDT2RES signal)
→ Non-maskable interrupt request mode: NMI operation upon overflow of watchdog timer 2 (generation of
INTWDT2 signal)
Note 2
• Input from main clock, internal oscillation clock, and subclock selectable as the source clock
Notes 1. Watchdog timer 2 automatically starts in the reset mode following reset release.
When watchdog timer 2 is not used, either stop its operation before reset is executed via this function, or
clear watchdog timer 2 once and stop it within the next interval time.
Also, write to the WDTM2 register for verification purposes once, even if the default settings (reset mode,
interval time: f
R/2
19
) do not need to be changed.
2. For the non-maskable interrupt servicing due to a non-maskable interrupt request signal (INTWDT2), see
23.2.2 (2) From INTWDT2 signal.