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RM0008
Digital-to-analog converter (DAC)
Figure 48. DAC conversion (SW trigger enabled) with LFSR wave generation
APB1_CLK
DHR
0x00
DOR
0xAAA
0xD55
SWTRIG
ai14714
Note:
12.3.9
DAC trigger must be enabled for noise generation, by setting the TENx bit in the DAC_CR
register.
Triangle-wave generation
It is possible to add a small-amplitude triangular waveform on a DC or slowly varying signal.
DAC triangle-wave generation is selected by setting WAVEx[1:0] to “10”. The amplitude is
configured through the MAMPx[3:0] bits in the DAC_CR register. An internal triangle counter
is incremented three APB1 clock cycles after each trigger event. The value of this counter is
then added to the DAC_DHRx register without overflow and the sum is stored into the
DAC_DORx register. The triangle counter is incremented while it is less than the maximum
amplitude defined by the MAMPx[3:0] bits. Once the configured amplitude is reached, the
counter is decremented down to 0, then incremented again and so on.
It is possible to reset triangle wave generation by resetting WAVEx[1:0] bits.
Figure 49. DAC triangle wave generation
Doc ID 13902 Rev 9
239/995
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