ST STM32L4 5 Series User Manual

Analog-to-digital converters (ADC) RM0351
516/1830 DocID024597 Rev 5
Software procedure to disable the ADC
1. Check that both ADSTART=0 and JADSTART=0 to ensure that no conversion is
ongoing. If required, stop any regular and injected conversion ongoing by setting
ADSTP=1 and JADSTP=1 and then wait until ADSTP=0 and JADSTP=0.
2. Set ADDIS=1.
3. If required by the application, wait until ADEN=0, until the analog ADC is effectively
disabled (ADDIS will automatically be reset once ADEN=0).
Figure 74. Enabling / Disabling the ADC
18.4.10 Constraints when writing the ADC control bits
The software is allowed to write the RCC control bits to configure and enable the ADC clock
(refer to RCC Section), the control bits DIFSEL in the ADC_DIFSEL register and the control
bits ADCAL and ADEN in the ADC_CR register, only if the ADC is disabled (ADEN must be
equal to 0).
The software is then allowed to write the control bits ADSTART, JADSTART and ADDIS of
the ADC_CR register only if the ADC is enabled and there is no pending request to disable
the ADC (ADEN must be equal to 1 and ADDIS to 0).
For all the other control bits of the ADC_CFGR, ADC_SMPRx, ADC_TRx, ADC_SQRx,
ADC_JDRy, ADC_OFRy, ADC_OFCHR and ADC_IER registers:
• For control bits related to configuration of regular conversions, the software is allowed
to write them only if the ADC is enabled (ADEN=1) and if there is no regular conversion
ongoing (ADSTART must be equal to 0).
• For control bits related to configuration of injected conversions, the software is allowed
to write them only if the ADC is enabled (ADEN=1) and if there is no injected
conversion ongoing (JADSTART must be equal to 0).
The software is allowed to write the control bits ADSTP or JADSTP of the ADC_CR register
only if the ADC is enabled and eventually converting and if there is no pending request to
disable the ADC (ADSTART or JADSTART must be equal to 1 and ADDIS to 0).
The software can write the register ADC_JSQR at any time, when the ADC is enabled
(ADEN=1).
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ST STM32L4 5 Series Specifications

General

Brand	ST
Model	STM32L4 5 Series
Category	Microcontrollers
Language	English