NXP Semiconductors MKW01Z128, Reference Manual

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25.4 CMP interrupts
The CMP module is capable of generating an interrupt on either the rising- or falling-
edge of the comparator output, or both.
The following table gives the conditions in which the interrupt request is asserted and
deasserted.
When Then
SCR[IER] and SCR[CFR] are set The interrupt request is asserted
SCR[IEF] and SCR[CFF] are set The interrupt request is asserted
SCR[IER] and SCR[CFR] are cleared for a rising-edge
interrupt The interrupt request is deasserted
SCR[IEF] and SCR[CFF] are cleared for a falling-edge
interrupt The interrupt request is deasserted
25.5 DMA support
Normally, the CMP generates a CPU interrupt if there is a change on the COUT. When
DMA support is enabled by setting SCR[DMAEN] and the interrupt is enabled by setting
SCR[IER], SCR[IEF], or both, the corresponding change on COUT forces a DMA
transfer request rather than a CPU interrupt instead. When the DMA has completed the
transfer, it sends a transfer completing indicator that deasserts the DMA transfer request
and clears the flag to allow a subsequent change on comparator output to occur and force
another DMA request.
The comparator can remain functional in STOP modes.
When DMA support is enabled by setting SCR[DMAEN] and the interrupt is enabled by
setting SCR[IER], SCR[IEF], or both, the corresponding change on COUT forces a DMA
transfer request to wake up the system from STOP modes. After the data transfer has
finished, system will go back to STOP modes. Refer to DMA chapters in the device
reference manual for the asynchronous DMA function for details.
25.6 CMP Asynchronous DMA support
The comparator can remain functional in STOP modes.
Chapter 25 Comparator (CMP)
MKW01Z128 MCU Reference Manual, Rev. 3, 04/2016
Freescale Semiconductor, Inc. 499