Table 35. External Trigger For Regular Channels - ST STM32F205 series Reference Manual

Analog-to-digital converter (ADC)
TIM1_CH1 event
TIM1_CH2 event
TIM1_CH3 event
TIM2_CH2 event
TIM2_CH3 event
TIM2_CH4 event
TIM2_TRGO event
TIM3_CH1 event
TIM3_TRGO event
TIM4_CH4 event
TIM5_CH1 event
TIM5_CH2 event
TIM5_CH3 event
TIM8_CH1 event
TIM8_TRGO event
EXTI line11
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Table 35. External trigger for regular channels

Source
gives the possible external trigger for injected conversion.
Type
Internal signal from on-chip
timers
External pin
RM0033 Rev 8
RM0033
EXTSEL[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111