ST STM32L0x3 User Manual

RM0367 Rev 7 359/1043
RM0367 Digital-to-analog converter (DAC)
376
Independent trigger without wave generation
To configure the DAC in this conversion mode, the following sequence is required:
1. Set the two DAC channel trigger enable bits TEN1 and TEN2
2. Configure different trigger sources by setting different values in the TSEL1[2:0] and
TSEL2[2:0] bits
3. Load the dual DAC channel data into the desired DHR register (DAC_DHR12RD,
DAC_DHR12LD or DAC_DHR8RD)
When a DAC channel1 trigger arrives, the DHR1 register is transferred into DAC_DOR1
(three APB clock cycles later).
When a DAC channel2 trigger arrives, the DHR2 register is transferred into DAC_DOR2
(three APB clock cycles later).
Independent trigger with single LFSR generation
To configure the DAC in this conversion mode (refer to Section 15.7: Noise generation), the
following sequence is required:
1. Set the two DAC channel trigger enable bits TEN1 and TEN2
2. Configure different trigger sources by setting different values in the TSEL1[2:0] and
TSEL2[2:0] bits
3. Configure the two DAC channel WAVEx[1:0] bits as “01” and the same LFSR mask
value in the MAMPx[3:0] bits
4. Load the dual DAC channel data into the desired DHR register (DHR12RD, DHR12LD
or DHR8RD)
When a DAC channel1 trigger arrives, the LFSR1 counter, with the same mask, is added to
the DHR1 register and the sum is transferred into DAC_DOR1 (three APB clock cycles
later). Then the LFSR1 counter is updated.
When a DAC channel2 trigger arrives, the LFSR2 counter, with the same mask, is added to
the DHR2 register and the sum is transferred into DAC_DOR2 (three APB clock cycles
later). Then the LFSR2 counter is updated.
Independent trigger with different LFSR generation
To configure the DAC in this conversion mode (refer to Section 15.7: Noise generation), the
following sequence is required:
1. Set the two DAC channel trigger enable bits TEN1 and TEN2
2. Configure different trigger sources by setting different values in the TSEL1[2:0] and
TSEL2[2:0] bits
3. Configure the two DAC channel WAVEx[1:0] bits as “01” and set different LFSR masks
values in the MAMP1[3:0] and MAMP2[3:0] bits
4. Load the dual DAC channel data into the desired DHR register (DAC_DHR12RD,
DAC_DHR12LD or DAC_DHR8RD)
When a DAC channel1 trigger arrives, the LFSR1 counter, with the mask configured by
MAMP1[3:0], is added to the DHR1 register and the sum is transferred into DAC_DOR1
(three APB clock cycles later). Then the LFSR1 counter is updated.
When a DAC channel2 trigger arrives, the LFSR2 counter, with the mask configured by
MAMP2[3:0], is added to the DHR2 register and the sum is transferred into DAC_DOR2
(three APB clock cycles later). Then the LFSR2 counter is updated.

ST STM32L0x3 Specifications

General

Brand	ST
Model	STM32L0x3
Category	Microcontrollers
Language	English