
WDOG_CS field descriptions (continued)
Field
Description
0
Watchdog disabled.
1
Watchdog enabled.
6
INT
Watchdog Interrupt
This write-once bit configures the watchdog to immediately generate an interrupt request upon a reset-
triggering event (timeout or illegal write to the watchdog), before forcing a reset. After the interrupt vector
fetch (which comes after the reset-triggering event), the reset occurs after a delay of 128 bus clocks.
0
Watchdog interrupts are disabled. Watchdog resets are not delayed.
1
Watchdog interrupts are enabled. Watchdog resets are delayed by 128 bus clocks from the interrupt
vector fetch.
5
UPDATE
Allow updates
This write-once bit allows software to reconfigure the watchdog without a reset.
0
Updates not allowed. After the initial configuration, the watchdog cannot be later modified without
forcing a reset.
1
Updates allowed. Software can modify the watchdog configuration registers within 128 bus clocks
after performing the unlock write sequence.
4–3
TST
Watchdog Test
Enables the fast test mode. The test mode allows software to exercise all bits of the counter to
demonstrate that the watchdog is functioning properly. See the
This write-once field is cleared (0:0) on POR only. Any other reset does not affect the value of this field.
00
Watchdog test mode disabled.
01
Watchdog user mode enabled. (Watchdog test mode disabled.) After testing the watchdog, software
should use this setting to indicate that the watchdog is functioning normally in user mode.
10
Watchdog test mode enabled, only the low byte is used. CNT[CNTLOW] is compared with
TOVAL[TOVALLOW].
11
Watchdog test mode enabled, only the high byte is used. CNT[CNTHIGH] is compared with
TOVAL[TOVALHIGH].
2
DBG
Debug Enable
This write-once bit enables the watchdog to operate when the chip is in debug mode.
0
Watchdog disabled in chip debug mode.
1
Watchdog enabled in chip debug mode.
1
WAIT
Wait Enable
This write-once bit enables the watchdog to operate when the chip is in wait mode.
0
Watchdog disabled in chip wait mode.
1
Watchdog enabled in chip wait mode.
0
STOP
Stop Enable
This write-once bit enables the watchdog to operate when the chip is in stop mode.
0
Watchdog disabled in chip stop mode.
1
Watchdog enabled in chip stop mode.
Memory map and register definition
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
712
NXP Semiconductors
Summary of Contents for KE1xF Series
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