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Eric:
关于F2807x，内部1.2v的VREG是可以用的，如下面手册说明，F2837x是需要加外部的1.2V电源，内部不支持。
5.7.1 Power Management
5.7.1.1 Internal 1.2-V VREG
The internal VREG is supplied by VDDIO and generates the 1.2 V required to power the VDD pins. Enable
this functionality by pulling the VREGENZ pin low to VSS. Although the internal VREG eliminates the need
to use an external power supply for VDD, decoupling capacitors are required on each VDD pin for VREG
stability (see the description of VDD in Table 4-1).
