MK30DN512ZVLK10 Freescale Semiconductor, MK30DN512ZVLK10 Datasheet - Page 494

• Manufacturer Part Number: MK30DN512ZVLK10
• Description: ARM Microcontrollers - MCU KINETIS 512K SLCD
• Manufacturer: Freescale Semiconductor

Specifications of MK30DN512ZVLK10

• Core: ARM Cortex M4
• Processor Series: K30
• Data Bus Width: 32 bit
• Maximum Clock Frequency: 50 MHz
• Program Memory Size: 512 KB
• Data Ram Size: 128 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 1.71 V to 3.6 V
• Operating Temperature Range: - 40 C to + 105 C
• Package / Case: LQFP-80
• Mounting Style: SMD/SMT

Testing the Watchdog
The entry into Debug mode within WCT time after reset is treated differently. The
WDOG timer is kept reset to zero and there is no need to unlock and configure it within
WCT time. You must not try to refresh or unlock the WDOG in this state or unknown
behavior may result. Upon exit from this mode, the WDOG timer restarts and the WDOG
has to be unlocked and configured within WCT time.
23.4 Testing the Watchdog
For IEC 60730 and other safety standards, the expectation is that anything that monitors a
safety function must be tested and this test is required to be fault tolerant. To test the
watchdog, its main timer and its associated compare and reset logic must be tested.
Towards this end, two tests are implemented for the watchdog that are described in
Test
mode (functional), there is an overriding test-disable control bit which once set, disables
the test mode permanently until reset.
For running a particular test, first select that test. Thereafter, set a certain test mode bit to
put the watchdog in the functional test mode. Setting this bit automatically switches the
watchdog timer to a fast clock source. The switching of the clock source is done to
achieve a faster time-out and hence a faster test. In a successful test, the timer times out
after reaching the programmed time-out value and generates a system reset.
23.4.1 Quick Test
In this test the time-out value of watchdog timer is programmed to a very low value to
achieve quick time-out. The only difference between the quick test and the normal mode
of functioning of the watchdog is that the test mode bit is set for the quick test. This
allows quick test of the watchdog reset mechanism.
494
and
Byte
After emerging from a reset due to a watchdog test, you must
follow the mandatory steps of unlocking and configuring the
watchdog. The refresh and unlock operations and interrupt are
not automatically disabled in the test mode.
Test. While there is a control bit provided to put the watchdog into the test
K30 Sub-Family Reference Manual, Rev. 6, Nov 2011
Note
Freescale Semiconductor, Inc.
Quick