Analog-to-digital converter (ADC) RM0367
340/1043 RM0367 Rev 7
14.12.3 ADC control register (ADC_CR)
Address offset: 0x08
Reset value: 0x0000 0000
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
ADCAL Res. Res.
ADVR
EGEN
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res.
rs rw
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. ADSTP Res.
ADSTA
RT
ADDIS ADEN
rs rs rs rs
Bit 31 ADCAL: ADC calibration
This bit is set by software to start the calibration of the ADC.
It is cleared by hardware after calibration is complete.
0: Calibration complete
1: Write 1 to calibrate the ADC. Read at 1 means that a calibration is in progress.
Note: The software is allowed to set ADCAL only when the ADC is disabled (ADCAL = 0,
ADSTART = 0, ADSTP = 0, ADDIS = 0 and ADEN = 0).
The software is allowed to update the calibration factor by writing ADC_CALFACT only when
ADEN = 1 and ADSTART = 0 (ADC enabled and no conversion is ongoing).
Bits 30:29 Reserved, must be kept at reset value.
Bit 28 ADVREGEN: ADC Voltage Regulator Enable
This bit can be set:
– by software, to enable the ADC internal voltage regulator.
– by hardware, when launching the calibration (setting ADCAL = 1) or when enabling the ADC (setting
ADEN = 1)
It is cleared by software to disable the voltage regulator. It can be cleared only if ADEN is set to 0.
0: ADC voltage regulator disabled
1: ADC voltage regulator enabled
Note: The software can program this bit field only when the ADC is disabled (ADCAL = 0,
ADSTART = 0, ADSTP = 0, ADDIS = 0 and ADEN = 0).
Bits 27:5 Reserved, must be kept at reset value.
Bit 4 ADSTP: ADC stop conversion command
This bit is set by software to stop and discard an ongoing conversion (ADSTP Command).
It is cleared by hardware when the conversion is effectively discarded and the ADC is ready to
accept a new start conversion command.
0: No ADC stop conversion command ongoing
1: Write 1 to stop the ADC. Read 1 means that an ADSTP command is in progress.
Note: Setting ADSTP to ‘1’ is only effective when ADSTART = 1 and ADDIS = 0 (ADC is enabled and
may be converting and there is no pending request to disable the ADC)
Bit 3 Reserved, must be kept at reset value.
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