RL78/G1H CHAPTER 12 WATCHDOG TIMER
R01UH0575EJ0120 Rev. 1.20 Page 273 of 920
Dec 22, 2016
CHAPTER 12 WATCHDOG TIMER
12.1 Functions of Watchdog Timer
The watchdog timer is used to detect an inadvertent program loop. If a program loop is detected, an internal reset
signal is generated.
The watchdog timer operates on the low-speed on-chip oscillator clock (f
IL).
The counting operation of the watchdog timer is set by the option byte (000C0H).
Program loop is detected in the following cases.
• If the watchdog timer counter overflows
• If a 1-bit manipulation instruction is executed on the watchdog timer enable register (WDTE)
• If data other than “ACH” is written to the WDTE register
• If data is written to the WDTE register during a window close period
When a reset occurs due to the watchdog timer, bit 4 (WDTRF) of the reset control flag register (RESF) is set to 1.
For details of the RESF register, see CHAPTER 21 RESET FUNCTION.
When 75% + 1/2 f
IL of the overflow time is reached, an interval interrupt can be generated.
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