Analog/digital converter (ADC) UM0306
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The total number of conversions in the injected group must be written in the L[1:0] bits
in the ADC_JSQR register.
If the ADC_SQRx or ADC_JSQR registers are modified during a conversion, the current
conversion is reset and a new start pulse is sent to the ADC to convert the new chosen
group.
Temperature sensor/V
REFINT
internal channels
The Temperature sensor is connected to channel ADC_IN16 and the internal reference
voltage V
REFINT
is connected to ADC_IN17. These two internal channels can be selected
and converted as injected or regular channels.
Note: The sensor and V
REFINT
are only available on the master ADC peripheral.
19.4.4 Single conversion mode
In Single conversion mode the ADC does one conversion. This mode is started either by
setting the ADON bit in the ADC_CR2 register (for a regular channel only) or by external
trigger (for a regular or injected channel), while the CONT bit is 0.
Once the conversion of the selected channel is complete:
● If a regular channel was converted:
– The converted data is stored in the 16-bit ADC_DR register
– The EOC (End Of Conversion) flag is set
– and an interrupt is generated if the EOCIE is set.
● If an injected channel was converted:
– The converted data is stored in the 16-bit ADC_DRJ1 register
– The JEOC (End Of Conversion Injected) flag is set
– and an interrupt is generated if the JEOCIE bit is set.
The ADC is then stopped.
19.4.5 Continuous conversion mode
In continuous conversion mode ADC starts another conversion as soon as it finishes one.
This mode is started either by external trigger or by setting the ADON bit in the ADC_CR2
register, while the CONT bit is 1.
After each conversion:
● If a regular channel was converted:
– The converted data is stored in the 16-bit ADC_DR register
– The EOC (End Of Conversion) flag is set
– An interrupt is generated if the EOCIE is set.
● If an injected channel was converted:
– The converted data is stored in the 16-bit ADC_DRJ1 register
– The JEOC (End Of Conversion Injected) flag is set
– An interrupt is generated if the JEOCIE bit is set.
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