Information

watchdog clock cycle delay in the timer restarting. In case the duration of the stop
mode is less than one watchdog clock cycle, the watchdog timer is not guaranteed to
pause.
• Consider the case when the first refresh value is written, following which the system
enters stop mode with system bus clk still on. If the second refresh value is not
written within 20 bus cycles of the first value, the system is reset, or interrupt-then-
reset if enabled.
Restrictions on watchdog operation
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
428 Freescale Semiconductor, Inc.