ST STM32L0x3 User Manual

RM0367 Rev 7 357/1043
RM0367 Digital-to-analog converter (DAC)
376
For code example, refer to A.9.2: Independent trigger with single triangle generation code
example.
15.5.3 DAC output voltage
Digital inputs are converted to output voltages on a linear conversion between 0 and V
REF+
.
The analog output voltages on each DAC channel pin are determined by the following
equation:
15.5.4 DAC trigger selection
If the TENx control bit is set, conversion can then be triggered by an external event (timer
counter, external interrupt line). The TSELx[2:0] control bits determine which possible
events will trigger conversion as shown in Table 70.
Each time a DAC interface detects a rising edge on the selected timer TRGO output, or on
the selected external interrupt line 9, the last data stored into the DAC_DHRx register are
transferred into the DAC_DORx register. The DAC_DORx register is updated three APB1
cycles after the trigger occurs.
If the software trigger is selected, the conversion starts once the SWTRIG bit is set.
SWTRIG is reset by hardware once the DAC_DORx register has been loaded with the
DAC_DHRx register contents.
Note: TSELx[2:0] bit cannot be changed when the ENx bit is set. When software trigger is
selected, the transfer from the DAC_DHRx register to the DAC_DORx register takes only
one APB1 clock cycle.
DACoutput V
REF+
DOR
4096
--------------
×=
Table 70. External triggers
Source Type TSEL[2:0]
TIM6 TRGO event
Internal signal from on-chip
timers
000
TIM3 TRGO event 001
TIM3 CH3 event 010
TIM21 TRGO event 011
TIM2 TRGO event 100
TIM7 TRGO event 101
EXTI line9 External pin 110
SWTRIG Software control bit 111

ST STM32L0x3 Specifications

General

Brand	ST
Model	STM32L0x3
Category	Microcontrollers
Language	English