STM32L476RG VREF 2.5V to AD?

[SWenn.1]

VREFBUF_TypeDef adRef;
  adRef.CSR |= VREFBUF_CSR_ENVR | VREFBUF_CSR_VRS;
  adRef.CSR &= ~VREFBUF_CSR_HIZ;

Can someone tell me why I cannot set the AD VREF+ to 2.5V?

[TDK · Accepted solution]

Your package doesn't have a dedicated VREF+ pin. From the datasheet:

The VREF+ pin is double-bonded with VDDA on some packages. In these packages the internal voltage reference buffer is not available.

The datasheet shows pin 13 is VDDA/VREF+.

[SWenn.1]

Thank you....That was what I saw also....