Chapter 8 Watchdog Timer; Functions Of Watchdog Timer - Renesas RL78/G1P Hardware User Manual

16-bit single-chip microcontroller

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The counting operation of the watchdog timer is set by the option byte (000C0H).

The watchdog timer operates on the low-speed on-chip oscillator clock.

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 (WDTRF) of the reset control flag register (RESF) is set to 1. For

details of the RESF register, see CHAPTER 17 RESET FUNCTION.

When 75% of the overflow time + 1/2/f

R01UH0895EJ0100 Rev.1.00

Nov 29, 2019

CHAPTER 8 WATCHDOG TIMER

is reached, an interval interrupt can be generated.

CHAPTER 8 WATCHDOG TIMER