Ito, [quote userid="584182" url="~/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1358807/tms320f28384d-cpu-does-not-start-up-according-to-datasheet"]・After 3.3V starts up , 1.2V starts up about 200ms later. When external reset is input about 530ms after that, the CPU does not start up.[/quote] The CPU never starts when this is done? How are you determining whether the CPU has correctly booted? Do you have some simple test code in flash? Also, is XRSn being driven high externally somehow? XRSn should be treated as open-drain, so it should be driven low and simply released to go high. Best Regards, Ben Collier
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