NXP Semiconductors K32 L2A Series, Reference Manual, Page: 1365 / 1379

When Window mode is enabled, the watchdog must be refreshed after the counter has
reached a minimum expected time value; otherwise, the watchdog resets the MCU. The
minimum expected time value is specified in the WIN register. Setting CS[WIN] enables
Window mode.
54.3.1.2 Refreshing the Watchdog
The refresh write sequence can be the following:
• One 32-bit write (0xB480_A602) to the CNT register.
This must occur before the WDOG timeout; otherwise, the watchdog resets the MCU.
Note
Before starting the refresh sequence, disable the global
interrupts. Otherwise, an interrupt could effectively invalidate
the refresh sequence, if the interrupt occurs before the refresh
writes finish. After the sequence finishes, re-enable the global
interrupts.
54.3.1.3 Example code: Refreshing the Watchdog
The following code segment shows the refresh write sequence of the WDOG module.
The refresh command access size is 32-bit.
/* Refresh watchdog */
for (;;) // main loop
{
...
DisableInterrupts; // disable global interrupt
WDOG_CNT = 0xB480A602; // write the refresh word
EnableInterrupts; // enable global interrupt
...
}
Chapter 54 Watchdog timer (WDOG32)
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors 1365