RM0090: Reference manual - STMicroelectronics

Analog-to-digital converter (ADC) RM0090
11.11 Battery charge monitoring
The VBATE bit in the ADC_CCR register is used to switch to the battery voltage. As the
V BAT voltage could be higher than V DDA , to ensure the correct operation of the ADC, the
V BAT pin is internally connected to a bridge divider.
When the VBATE is set, the bridge is automatically enabled to connect:
● VBAT/2 to the ADC1_IN18 input channel, on STM32F40xx and STM32F41xx devices
● VBAT/4 to the ADC1_IN18 input channel, on STM32F42xx and STM32F43xx devices
11.12 ADC interrupts
An interrupt can be produced on the end of conversion for regular and injected groups, when
the analog watchdog status bit is set and when the overrun status bit is set. Separate
interrupt enable bits are available for flexibility.
Two other flags are present in the ADC_SR register, but there is no interrupt associated with
them:
● JSTRT (Start of conversion for channels of an injected group)
● STRT (Start of conversion for channels of a regular group)
Table 51. ADC interrupts
287/1416 Doc ID 018909 Rev 3
Interrupt event Event flag Enable control bit
End of conversion of a regular group EOC EOCIE
End of conversion of an injected group JEOC JEOCIE
Analog watchdog status bit is set AWD AWDIE
Overrun OVR OVRIE