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NOTE
When the watchdog is configured by user, it needs at least 2.5
periods of watchdog clock to take effect. This means interval
between two configures by user must be larger than 2.5 clocks.
NOTE
When Chip startup from BOOT ROM then jump to flash, the
watchdog would be enabled in the beginning of bootloader, and
disabled when bootloader exits. If there is any code in the flash
program want to reconfigure the watchdog, it must be run 2.5
watchdog clocks later after the bootloader exits.
To disable or reconfigure the watchdog without forcing a reset, the unlock sequence must
be done.
29.5.1 Disable Watchdog
To disable the watchdog, first do unlock sequence, then unset the WDOG_CS[EN] bit.
DisableInterrupts; // disable global interrupt
WDOG_CNT = 0xD928C520; // unlock watchdog
WDOG_CS &= ~WDOG_CS_EN_MASK; // disable watchdog
EnableInterrupts; // enable global interrupt
29.5.2 Configure Watchdog
The watchdog can be configured once by set the WDOG_CS[UPDATE]=0. After that,
the watchdog cannot be reconfigured until a reset.If set WDOG_CS[UPDATE]=1 when
configuring the watchdog, the watchdog can be reconfigured without forcing a reset.The
following example code shows how to configure the watchdog without window mode,
clock source as LPO, interrupt enabled and timeout value to 256 clocks.
Configure once
DisableInterrupts; //disable global interrupt
WDOG_CNT = 0xD928C520; //unlock watchdog
while(WDOG_CS[ULK]==0); //wait until registers are unlocked
WDOG_TOVAL = 256; //set timeout value
WDOG_CS = WDOG_CS_EN(1) | WDOG_CS_CLK(1) | WDOG_CS_INT(1) |
WDOG_CS_WIN(0) | WDOG_CS_UPDATE(0);
while(WDOG_CS[RCS]==0); //wait until new configuration takes effect
EnableInterrupts; //enable global interrupt
Configure for reconfigurable
DisableInterrupts; //disable global interrupt
WDOG_CNT = 0xD928C520; //unlock watchdog
while(WDOG_CS[ULK]==0); //wait until registers are unlocked
WDOG_TOVAL = 256; //set timeout value
WDOG_CS = WDOG_CS_EN(1) | WDOG_CS_CLK(1) | WDOG_CS_INT(1) |
Application Information
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
620
NXP Semiconductors
Содержание Kinetis KE1xZ256
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