DACx_C0 field descriptions (continued)
Field
Description
0
The DAC buffer read pointer bottom flag interrupt is disabled.
1
The DAC buffer read pointer bottom flag interrupt is enabled.
35.4.5 DAC Control Register 1 (DACx_C1)
Address: 4003_F000h base + 22h offset = 4003_F022h
Bit
7
6
5
4
3
2
1
0
Read
Write
Reset
0
0
0
0
0
0
0
0
DACx_C1 field descriptions
Field
Description
7
DMAEN
DMA Enable Select
0
DMA is disabled.
1
DMA is enabled. When DMA is enabled, the DMA request will be generated by original interrupts. The
interrupts will not be presented on this module at the same time.
6–5
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
4–3
DACBFWM
DAC Buffer Watermark Select
In normal mode it controls when SR[DACBFWMF] is set. When the DAC buffer read pointer reaches the
word defined by this field, which is 1–4 words away from the upper limit (DACBUP), SR[DACBFWMF] will
be set. This allows user configuration of the watermark interrupt. In FIFO mode, it is FIFO watermark
select field.
00
In normal mode, 1 word . In FIFO mode, 2 or less than 2 data remaining in FIFO will set watermark
status bit.
01
In normal mode, 2 words . In FIFO mode, Max/4 or less than Max/4 data remaining in FIFO will set
watermark status bit.
10
In normal mode, 3 words . In FIFO mode, Max/2 or less than Max/2 data remaining in FIFO will set
watermark status bit.
11
In normal mode, 4 words . In FIFO mode, Max-2 or less than Max-2 data remaining in FIFO will set
watermark status bit.
2–1
DACBFMD
DAC Buffer Work Mode Select
00
Normal mode
01
Swing mode
10
One-Time Scan mode
11
FIFO mode
0
DACBFEN
DAC Buffer Enable
0
Buffer read pointer is disabled. The converted data is always the first word of the buffer.
1
Buffer read pointer is enabled. The converted data is the word that the read pointer points to. It means
converted data can be from any word of the buffer.
Chapter 35 12-bit Digital-to-Analog Converter (DAC)
K22F Sub-Family Reference Manual , Rev. 3, 7/2014
Freescale Semiconductor, Inc.
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