Datasheet

V850ES/JG3 CHAPTER 11 FUNCTIONS OF WATCHDOG TIMER 2
R01UH0015EJ0300 Rev.3.00 Page 394 of 870
Sep 30, 2010
CHAPTER 11 FUNCTIONS OF WATCHDOG TIMER 2
11.1 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 selectable from main clock, internal oscillation clock, and subclock 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 only 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
19.2.2 (2) From INTWDT2 signal.