Renesas RL78/F14 User Manual

RL78/F13, F14 CHAPTER 11 WATCHDOG TIMER
R01UH0368EJ0210 Rev.2.10 693
Dec 10, 2015
CHAPTER 11 WATCHDOG TIMER
11.1 Functions of Watchdog Timer
The watchdog timer operates on the WDT-dedicated low-speed on-chip oscillator clock (f
WDT).
The watchdog timer is used to detect an inadvertent program loop. If a program loop is detected, an internal reset signal
is generated.
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 (WDCLRF) of the reset control flag register (RESF) is set to 1. For
details of the RESF register, see CHAPTER 24 RESET FUNCTION.
When 75% of the overflow time + 1/2 f
WDT is reached, an interval interrupt can be generated.

Renesas RL78/F14 Specifications

General

Brand	Renesas
Model	RL78/F14
Category	Computer Hardware
Language	English