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Analog-to-digital converter (ADC) RM0453

544/1461 RM0453 Rev 1

18.3.10 Single conversion mode (CONT = 0)

In Single conversion mode, the ADC performs a single sequence of conversions, converting

all the channels once. This mode is selected when CONT = 0 in the ADC_CFGR1 register.

Conversion is started by either:

• Setting the ADSTART bit in the ADC_CR register

• Hardware trigger event

Inside the sequence, after each conversion is complete:

• The converted data are stored in the 16-bit ADC_DR register

• The EOC (end of conversion) flag is set

• An interrupt is generated if the EOCIE bit is set

After the sequence of conversions is complete:

• The EOS (end of sequence) flag is set

• An interrupt is generated if the EOSIE bit is set

Then the ADC stops until a new external trigger event occurs or the ADSTART bit is set

again.

Note: To convert a single channel, program a sequence with a length of 1.

18.3.11 Continuous conversion mode (CONT = 1)

In continuous conversion mode, when a software or hardware trigger event occurs, the ADC

performs a sequence of conversions, converting all the channels once and then

automatically re-starts and continuously performs the same sequence of conversions. This

mode is selected when CONT = 1 in the ADC_CFGR1 register. Conversion is started by

either:

• Setting the ADSTART bit in the ADC_CR register

• Hardware trigger event

Inside the sequence, after each conversion is complete:

• The converted data are stored in the 16-bit ADC_DR register

• The EOC (end of conversion) flag is set

• An interrupt is generated if the EOCIE bit is set

After the sequence of conversions is complete:

• The EOS (end of sequence) flag is set

• An interrupt is generated if the EOSIE bit is set

Then, a new sequence restarts immediately and the ADC continuously repeats the

conversion sequence.

Note: To convert a single channel, program a sequence with a length of 1.

It is not possible to have both discontinuous mode and continuous mode enabled: it is

forbidden to set both bits DISCEN

= 1 and CONT = 1.

ST STM32WL5 Series User Manual

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