38.12.3 DAC clocks
This module has a single clock input, the bus clock.
38.12.4 DAC interrupts
This module has no interrupts.
38.13 Trigger mode
The CMP and the 8-bit DAC are designed to support the trigger mode operation, which is
enabled when the MCU enters STOP modes with C2[RRE] and C0[EN] are set.
With this mode enabled, the trigger events that include the operation clock and a trigger
start signal will initiate a compare sequence that must first enable the CMP and DAC
prior to performing a CMP operation and capturing the output. A fixed channel for either
the plus-side mux or the minus-side mux is selected by software via C2[FXMP] and
C2[FXMXCH]. It is a mandatory request that the round-robin cycling period must be set
longer than the time that all the active channels complete the specified comparison cycles
set by C2[NSAM].
The active channels selected by C1[CHNn] are then routed to the non-fixed channel mux
and compared with the reference input in a round-robin manner. In order to meet the
comparator stabilization time, after the configurable number of operation clocks defined
by C2[NSAM], the comparison result is sampled for the selected channel. A software
pre-programmed state for each channel is configured by writing to C2[ACOn] field. After
all the active channels are sampled, if the comparison result changes from its pre-
programmed state, the corresponding flag in C2[CHnF] is set. If C2[RRIE] is set, an
asynchronous reset is asserted to bring the MCU out of STOP mode.
NOTE
These flags do not support generating a DMA transfer event.
This mode is active when the MCU is in STOP mode, so none of the window/filter
functions are available. A basic assumption of this mode is that the selected inputs are
changing at a much slower rate than the operation clock. It is suggested to configure the
comparator in low power comparison mode as well. In programming the C2[INITMOD]
registers, the INITMOD × round-robin clock period must be longer than the initialization
delay, which can be referred from the chip datasheet.
Trigger mode
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
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NXP Semiconductors
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