28335的内核1.9V电压和IO口3.3V电压的上电顺序可以用软件来规定吗？还是它自己在BootLoader里面已经规定好了的，如果我想更改上电顺序，我应该在哪里设置或者更改。
28335的内核1.9V电压和IO口3.3V电压的上电顺序可以用软件来规定吗？还是它自己在BootLoader里面已经规定好了的，如果我想更改上电顺序，我应该在哪里设置或者更改。
请您参考一下
www.ti.com.cn/.../tms320f28335.pdf
芯片工作没有上电顺序要求。但还是建议注意下面的话
"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."
如果VDD比VDDIO慢到达0.7V的话，上电时有可能出现一个小脉冲。
