NXP Semiconductors K32 L2A Series, Reference Manual, Page: 1357 / 1379

Chapter 54
Watchdog timer (WDOG32)
54.1 Introduction
The Watchdog Timer (WDOG) module is an independent timer that is available for
system use. It provides a safety feature to ensure that software is executing as planned
and that the CPU is not stuck in an infinite loop or executing unintended code. If the
WDOG module is not serviced (refreshed) within a certain period, it resets the MCU.
54.1.1 Features
Features of the WDOG32 module include:
• Configurable clock source inputs independent from the bus clock
• Bus clock (slow clock)
• LPO (1 kHz clock from PMC)
• SIRC (8 MHz IRC from SCG)
• ERCLK (external reference clock from SCG)
• Programmable timeout period
• Programmable 16-bit timeout value
• Optional fixed 256 clock prescaler when longer timeout periods are needed
• Robust write sequence for counter refresh
• Refresh sequence of writing 0x02A6 and then 0x80B4 within 16 bus clocks
• Window mode option for the refresh mechanism
• Programmable 16-bit window value
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors 1357