Figure 70. Dac Triangle Wave Generation; Figure 71. Dac Conversion (Sw Trigger Enabled) With Triangle Wave Generation; Dual Dac Channel Conversion - STMicroelectronics STM32F405 Reference Manual

Digital-to-analog converter (DAC)

Figure 71. DAC conversion (SW trigger enabled) with triangle wave generation

APB1_CLK
DHR
DOR
SWTRIG
Note: The DAC trigger must be enabled for noise generation by setting the TENx bit in the
DAC_CR register.
The MAMPx[3:0] bits must be configured before enabling the DAC, otherwise they cannot
be changed.
14.4

Dual DAC channel conversion

To efficiently use the bus bandwidth in applications that require the two DAC channels at the
same time, three dual registers are implemented: DHR8RD, DHR12RD and DHR12LD. A
unique register access is then required to drive both DAC channels at the same time.
Eleven possible conversion modes are possible using the two DAC channels and these dual
registers. All the conversion modes can nevertheless be obtained using separate DHRx
registers if needed.
All modes are described in the paragraphs below.
14.4.1 Independent trigger without wave generation
To configure the DAC in this conversion mode, the following sequence is required:
•
Set the two DAC channel trigger enable bits TEN1 and TEN2
•
Configure different trigger sources by setting different values in the TSEL1[2:0] and
TSEL2[2:0] bits
• Load the dual DAC channel data into the desired DHR register (DAC_DHR12RD,
DAC_DHR12LD or DAC_DHR8RD)
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Figure 70. DAC triangle wave generation

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