NXP Semiconductors KE1xF Series, Reference Manual, Page: 916 / 1483

DACx_STATCTRL field descriptions (continued)
Field Description
1
DACBFRPTF
DAC Buffer Read Pointer Top Position Flag
In FIFO mode it is FIFO nearly empty flag. It is set when only one data remains in FIFO. Any DAC trigger
does not increase the Read Pointer if this bit is set to avoid any possible glitch or abrupt change at DAC
output. It is cleared automatically if FIFO is not empty.
0 The DAC buffer read pointer is not zero.
1 The DAC buffer read pointer is zero.
0
DACBFRPBF
DAC Buffer Read Pointer Bottom Position Flag
In FIFO mode it is FIFO FULL status bit. It means FIFO read pointer equals Write Pointer because of
Write Pointer increase. If this bit is set, any write to FIFO from either DMA or CPU is ignored by DAC. It is
cleared if there is any DAC trigger making the DAC read pointer increase. Write to this bit is ignored in
FIFO mode.
0 The DAC buffer read pointer is not equal to DACBFUP.
1 The DAC buffer read pointer is equal to DACBFUP.
39.6 Functional description
The 12-bit DAC module can select one of the two reference inputs—DACREF_1 and
DACREF_2 as the DAC reference voltage, V
in
by STATCTRL [DACRFS]. See the chip-
specific DAC information to determine the source options for DACREF_1 and
DACREF_2.
When the DAC is enabled, it converts the data in DACDAT0[11:0] or the data from the
DAC data buffer to a stepped analog output voltage. The output voltage range is from V
in
to V
in
∕4096, and the step is V
in
∕4096.
39.6.1 DAC data buffer operation
When the DAC is enabled and the buffer is not enabled, the DAC module always
converts the data in DAT0 to the analog output voltage.
When both the DAC and the buffer are enabled, the DAC converts the data in the data
buffer to analog output voltage. The data buffer read pointer advances to the next word
whenever a hardware or software trigger event occurs.
The data buffer can be configured to operate in Normal mode, Swing mode, One-Time
Scan mode or FIFO mode. When the buffer operation is switched from one mode to
another, the read pointer does not change. The read pointer can be set to any value
between 0 and STATCTRL[DACBFUP] by writing STATCTRL[DACBFRP].
Functional description
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
916 NXP Semiconductors