25.6.1.3 Selecting the Main Voltage Regulator
In Active mode, the type of the main voltage regulator supplying VDDCORE can be switched on the fly. The two alternatives are a LDO regulator and a Buck converter.
The main voltage regulator switching sequences are as follows:
- The user changes the value of the Voltage Regulator Selection bit in the Voltage Regulator System Control register (VREG.SEL)
- The start of the switching sequence is indicated by clearing the Voltage Regulator Ready bit in the STATUS register (STATUS.VREGRDY=0)
- Once the switching sequence is completed, STATUS.VREGRDY will read '1'