RM0090: Reference manual - STMicroelectronics

RM0090 Analog-to-digital converter (ADC)
A JEOC interrupt, if enabled, is generated after all injected ADC1 channels in the group
have been converted.
A JEOC interrupt, if enabled, is generated after all injected ADC2 channels in the group
have been converted.
A JEOC interrupt, if enabled, is generated after all injected ADC3 channels in the group
have been converted.
If another external trigger occurs after all injected channels in the group have been
converted then the alternate trigger process restarts by converting the injected ADC1
channels in the group.
Figure 50. Alternate trigger: injected group of each ADC
1st trigger
EOC, JEOC
4th trigger
EOC, JEOC
(n)th trigger
on ADC1
on ADC1
ADC1
ADC2
2nd trigger
EOC, JEOC
on ADC2
3rd trigger
11.9.5 Combined regular/injected simultaneous mode
(n+1)th trigger
It is possible to interrupt the simultaneous conversion of a regular group to start the
simultaneous conversion of an injected group.
Note: In combined regular/injected simultaneous mode, one must convert sequences with the
same length or ensure that the interval between triggers is longer than the long conversion
time of the 2 sequences (Dual ADC mode) /3 sequences (Triple ADC mode). Otherwise, the
ADC with the shortest sequence may restart while the ADC with the longest sequence is
completing the previous conversions.
11.9.6 Combined regular simultaneous + alternate trigger mode
Sampling
Conversion
It is possible to interrupt the simultaneous conversion of a regular group to start the
alternate trigger conversion of an injected group. Figure 51 shows the behavior of an
alternate trigger interrupting a simultaneous regular conversion.
The injected alternate conversion is immediately started after the injected event. If regular
conversion is already running, in order to ensure synchronization after the injected
conversion, the regular conversion of all (master/slave) ADCs is stopped and resumed
synchronously at the end of the injected conversion.
Note: In combined regular simultaneous + alternate trigger mode, one must convert sequences
with the same length or ensure that the interval between triggers is longer than the long
conversion time of the 2 sequences (Dual ADC mode) /3 sequences (Triple ADC mode).
Otherwise, the ADC with the shortest sequence may restart while the ADC with the longest
sequence is completing the previous conversions.
. . .
EOC, JEOC
on ADC3
5th trigger (n+2)th trigger
ai16061
Doc ID 018909 Rev 3 284/1416