Adc; Overrun Flag Not Set If Eoc Reset Coincides With New Conversion End; Aden Bit Cannot Be Set Immediately After The Adc Calibration; Comp - ST STM32F078CB Errata Sheet

Description of device limitations
2.7

ADC

2.7.1

Overrun flag not set if EOC reset coincides with new conversion end

Description
If the EOC flag is cleared by ADC_DR register read operation or by software during the
same APB cycle in which the data from a new conversion are written in the ADC_DR
register, the overrun event duly occurs (which results in the loss of either current or new
data) but the overrun flag (OVR) may stay low.
Workaround
Clear the EOC flag through ADC_DR register read operation or by software within less than
one ADC conversion cycle period from the last conversion cycle end, so as to avoid the
coincidence with the new conversion cycle end.
2.7.2

ADEN bit cannot be set immediately after the ADC calibration

Description
At the end of the ADC calibration, an internal reset of ADEN bit occurs four ADC clock
cycles after the ADCAL bit is cleared by hardware. As a consequence, if the ADEN bit is set
within those four ADC clock cycles, it is reset shortly after by the calibration logic and the
ADC remains disabled.
Workaround
1. Keep setting the ADEN bit until the ADRDY flag goes high.
2. After the ADCAL is cleared, wait for a minimum of four ADC clock cycles before setting
the ADEN bit.
2.8

COMP

2.8.1 Long V
Description
The V
REFINT
(1/2, 1/4 or 3/4) to the comparator input.
The maximum V
for the first activation of the V
conditions, it can be as much as 1 s. The startup time depends mainly on the voltage and
temperature. See the device datasheet for more details.
For correct operation of the V
must not be below 2 V.
Workaround
None.
16/21
scaler startup time after power on
REFINT
scaler is an embedded voltage follower providing the V
scaler startup time t
REFINT
REFINT
REFINT
DocID026420 Rev 2
(max), specified to 0.2 ms, is not respected
S_SC
scaler after powering on the device. In worst-case
scaler, the comparator analog supply voltage, V
STM32F078CB/RB/VB
or its fractions
REFINT
,
DDA