Conversion On External Trigger And Trigger Polarity; Table 44. Configuring The Trigger Polarity; Table 45. External Trigger For Regular Channels - ST STM32F410 Reference Manual

Analog-to-digital converter (ADC)
11.6

Conversion on external trigger and trigger polarity

Conversion can be triggered by an external event (e.g. timer capture, EXTI line). If the
EXTEN[1:0] control bits (for a regular conversion) or JEXTEN[1:0] bits (for an injected
conversion) are different from "0b00", then external events are able to trigger a conversion
with the selected polarity.
and JEXTEN[1:0] values and the trigger polarity.
Trigger detection disabled
Detection on the rising edge
Detection on the falling edge
Detection on both the rising and falling edges
Note: The polarity of the external trigger can be changed on the fly.
The EXTSEL[3:0] and JEXTSEL[3:0] control bits are used to select which out of 16 possible
events can trigger conversion for the regular and injected groups.
Table 45
TIM1_CH1 event
TIM1_CH2 event
TIM1_CH3 event
TIM5_CH1 event
TIM5_CH2 event
TIM5_CH3 event
Not used
Not used
EXTI line11
224/771
Table 44

Table 44. Configuring the trigger polarity

Source
gives the possible external trigger for regular conversion.

Table 45. External trigger for regular channels

Source
provides the correspondence between the EXTEN[1:0]
Type
Internal signal from on-chip
timers
External pin
RM0401 Rev 3
EXTEN[1:0] / JEXTEN[1:0]
00
01
10
11
EXTSEL[3:0]
0000
0001
0010
1010
1011
1100
1101
1110
1111
RM0401