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能解释一下，为什么和TMS320F28335上电顺序不一样？上电顺序不一样的原理？上电顺序相反可能会出现的风险？谢谢！
Eric:
F2837x 的上电顺序要求：
The voltage on VDDIO should be greater than VDD or no less than 0.3 V below VDD at all times. VDDIO,
VDD3VFL, VDDOSC, and VDDA should be powered up together and be kept within 0.3 V of each other during
operation. Before powering the device, no voltage larger than 0.3 V above VDDIO should be applied to any
digital pin, and no voltage larger than 0.3 V above VDDA should be applied to any analog pin.
F28335的上电顺序要求：
No requirements are placed on the power up/down sequence of the various power pins to ensure the
correct reset state for all the modules. However, if the 3.3-V transistors in the level shifting output buffers
of the I/O pins are powered prior to the 1.9-V transistors, it is possible for the output buffers to turn on,
causing a glitch to occur on the pin during power up. To avoid this behavior, power the VDD pins prior to or
simultaneously with the VDDIO pins, ensuring that the VDD pins have reached 0.7 V before the VDDIO pins
reach 0.7 V.
