RM0368 Datasheet, PDF (223/841 Pages) STMicroelectronics – This Reference manual targets application developers

RM0368
Analog-to-digital converter (ADC)
Note:
Table 44. External trigger for injected channels
Source
Connection type
JEXTSEL[3:0]
TIM1_CH4 event
0000
TIM1_TRGO event
TIM2_CH1 event
TIM2_TRGO event
TIM3_CH2 event
0001
0010
0011
0100
TIM3_CH4 event
0101
TIM4_CH1 event
TIM4_CH2 event
TIM4_CH3 event
TIM4_TRGO event
Internal signal from on-chip
timers
0110
0111
1000
1001
TIM5_CH4 event
TIM5_TRGO event
Reserved
Reserved
1010
1011
1100
1101
Reserved
1110
EXTI line15
External pin
1111
Software source trigger events can be generated by setting SWSTART (for regular
conversion) or JSWSTART (for injected conversion) in ADC_CR2.
A regular group conversion can be interrupted by an injected trigger.
The trigger selection can be changed on the fly. However, when the selection changes,
there is a time frame of 1 APB clock cycle during which the trigger detection is disabled.
This is to avoid spurious detection during transitions.
11.7
Fast conversion mode
It is possible to perform faster conversion by reducing the ADC resolution. The RES bits are
used to select the number of bits available in the data register. The minimum conversion
time for each resolution is then as follows:
• 12 bits: 3 + 12 = 15 ADCCLK cycles
• 10 bits: 3 + 10 = 13 ADCCLK cycles
• 8 bits: 3 + 8 = 11 ADCCLK cycles
• 6 bits: 3 + 6 = 9 ADCCLK cycles
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