NXP Semiconductors MKW01Z128, Reference Manual

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26.4.6 DAC Control Register 2 (DACx_C2)
Address: 4003_F000h base + 23h offset = 4003_F023h
Bit 7 6 5 4 3 2 1 0
Read 0
DACBFRP
0
DACBFUP
Write
Reset 0 0 0 0 0 0 0 1
DACx_C2 field descriptions
Field Description
7–5
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
4
DACBFRP
DAC Buffer Read Pointer
Keeps the current value of the buffer read pointer.
3–1
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
0
DACBFUP
DAC Buffer Upper Limit
Selects the upper limit of the DAC buffer. The buffer read pointer cannot exceed it.
26.5 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 C0 [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.
26.5.1 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.
Chapter 26 12-bit Digital-to-Analog Converter (DAC)
MKW01Z128 MCU Reference Manual, Rev. 3, 04/2016
Freescale Semiconductor, Inc. 509