WDOG counter
WIN
Refresh opportunity
in window mode
TOVAL
0
Time
Refresh opportunity (not in window mode)
Figure 29-2. Refresh opportunity for the Watchdog counter
29.4.2.1 Window mode
Software finishing its main control loop faster than expected could be an indication of a
problem. Depending on the requirements of the application, the WDOG can be
programmed to force a reset when refresh attempts are early.
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.
29.4.2.2 Refreshing the Watchdog
The refresh write sequence can be
• either two 16-bit writes ( 0xA602, 0xB480) or four 8-bit writes (0xA6, 0x02, 0xB4,
0x80) if WDOG_CS[CMD32EN] is 0;
• one 32-bit write (0xB480_A602) if WDOG_CS[CMD32EN] is 1.
Chapter 29 Watchdog timer (WDOG)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
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