Information

DACx_C1 field descriptions (continued)
Field Description
2–1
DACBFMD
DAC Buffer Work Mode Select
00 Normal mode
01 Swing mode
01 Reserved
10 One-Time Scan mode
11 Reserved
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.
34.4.6 DAC Control Register 2 (DACx_C2)
Address: 400C_C000h base + 23h offset = 400C_C023h
Bit 7 6 5 4 3 2 1 0
Read
DACBFRP DACBFUP
Write
Reset
0 0 0 0 1 1 1 1
DACx_C2 field descriptions
Field Description
7–4
DACBFRP
DAC Buffer Read Pointer
Keeps the current value of the buffer read pointer.
3–0
DACBFUP
DAC Buffer Upper Limit
Selects the upper limit of the DAC buffer. The buffer read pointer cannot exceed it.
34.5 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 module
introduction for information on the source 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.
Chapter 34 12-bit Digital-to-Analog Converter (DAC)
K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
Freescale Semiconductor, Inc.
Preliminary
799
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