how i can secure my code in bf533 and are there any security level in the processor ?
the BF533 has no support for "secure mode" like a BF54x processor. any attempt to secure your code would be defeated by anyone with JTAG or a soldering iron or probes (and can access the flashes).
if you dont care about hardware based attacks, then there is no need to "secure" your code. you'd have to be a bit more clear as to what it is you actually want to protect and from whom.
this Blackin Processor does not offer any security related functionality in hardware.
You can search for Lockbox Secure Technology on the ADI website, but this applies only the newer Blackfin derivatives like ADSP-BF54x and ADSP-BF52x
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