ST STM32G4 Series Reference Manual page 653

RM0440
Bit 2 ADSTART: ADC start of regular conversion
This bit is set by software to start ADC conversion of regular channels. Depending on the
configuration bits EXTEN, a conversion will start immediately (software trigger configuration)
or once a regular hardware trigger event occurs (hardware trigger configuration).
It is cleared by hardware:
– in single conversion mode when software trigger is selected (EXTSEL=0x0): at the assertion
of the End of Regular Conversion Sequence (EOS) flag.
– in all cases: after the execution of the ADSTP command, at the same time that ADSTP is
cleared by hardware.
0: No ADC regular conversion is ongoing.
1: Write 1 to start regular conversions. Read 1 means that the ADC is operating and
eventually converting a regular channel.
Note: The software is allowed to set ADSTART only when ADEN=1 and ADDIS=0 (ADC is
Bit 1 ADDIS: ADC disable command
This bit is set by software to disable the ADC (ADDIS command) and put it into power-down
state (OFF state).
It is cleared by hardware once the ADC is effectively disabled (ADEN is also cleared by
hardware at this time).
0: no ADDIS command ongoing
1: Write 1 to disable the ADC. Read 1 means that an ADDIS command is in progress.
Note: The software is allowed to set ADDIS only when ADEN=1 and both ADSTART=0 and
Bit 0 ADEN: ADC enable control
This bit is set by software to enable the ADC. The ADC will be effectively ready to operate
once the flag ADRDY has been set.
It is cleared by hardware when the ADC is disabled, after the execution of the ADDIS
command.
0: ADC is disabled (OFF state)
1: Write 1 to enable the ADC.
Note: The software is allowed to set ADEN only when all bits of ADC_CR registers are 0
enabled and there is no pending request to disable the ADC)
In auto-injection mode (JAUTO=1), regular and auto-injected conversions are started by
setting bit ADSTART (JADSTART must be kept cleared)
JADSTART=0 (which ensures that no conversion is ongoing)
(ADCAL=0, JADSTART=0, ADSTART=0, ADSTP=0, ADDIS=0 and ADEN=0) except for
bit ADVREGEN which must be 1 (and the software must have wait for the startup time of
the voltage regulator)
RM0440 Rev 1
Analog-to-digital converters (ADC)
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