Independent Mode; Combined Regular/Injected Simultaneous Mode; Combined Regular Simultaneous + Alternate Trigger Mode; Figure 35. Alternate Trigger: 4 Injected Channels (Each Adc) In Discontinuous Model - ST STM32F101 series Reference Manual

RM0008
If the injected discontinuous mode is enabled for both ADC1 and ADC2:
•
When the 1st trigger occurs, the first injected channel in ADC1 is converted.
•
When the 2nd trigger arrives, the first injected channel in ADC2 are converted
•
and so on....
A JEOC interrupt, if enabled, is generated after all injected group channels of ADC1 are
converted.
A JEOC interrupt, if enabled, is generated after all injected group channels of ADC2 are
converted.
If another external trigger occurs after all injected group channels have been converted then
the alternate trigger process restarts.

Figure 35. Alternate trigger: 4 injected channels (each ADC) in discontinuous model

1st trigger
ADC1
ADC2
11.9.6

Independent mode

In this mode the dual ADC synchronization is bypassed and each ADC interfaces works
independently.
11.9.7

Combined regular/injected simultaneous mode

It is possible to interrupt simultaneous conversion of a regular group to start simultaneous
conversion of an injected group.
Note: In combined regular/injected simultaneous mode, exactly the same sampling time should be
configured for the two channels that will be sampled simultaneously by ACD1 and ADC2.
11.9.8

Combined regular simultaneous + alternate trigger mode

It is possible to interrupt regular group simultaneous conversion to start alternate trigger
conversion of an injected group.
interrupting a regular simultaneous conversion.
The injected alternate conversion is immediately started after the injected event arrives. If
regular conversion is already running, in order to ensure synchronization after the injected
conversion, the regular conversion of both (master/slave) ADCs is stopped and resumed
synchronously at the end of the injected conversion.
Note: In combined regular simultaneous + alternate trigger mode, exactly the same sampling time
should be configured for the two channels that will be sampled simultaneously by ACD1 and
ADC2.
3rd trigger
2nd trigger 4th trigger
DocID13902 Rev 15
5th trigger 7th trigger
6th trigger
Figure 36 shows the behavior of an alternate trigger
Analog-to-digital converter (ADC)
JEOC on ADC1
JEOC on ADC2
8th trigger
Sampling
Conversion
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