TMS320F28069: TMS320F28069MPZPQ 有密码输入环节吗？

您好

https://www.ti.com.cn/cn/lit/ug/spruh18i/spruh18i.pdf

这是官方这个IC的TRM文件中第52页对于这个问题有详细说明，请您参考

The password is stored in code security password locations (PWL) in flash memory (0x3F 7FF8 - 0x3F 7FFF). These locations store the password predetermined by the system designer. If the password locations have all 128 bits as ones, the device is labeled unsecure. Since new flash devices have erased flash (all ones), only a read of the password locations is required to bring the device into unsecure mode. If the password locations have all 128 bits as zeros, the device is secure, regardless of the contents of the KEY registers. Do not use all zeros as a password or reset the device during an erase of the flash. Resetting the device during an erase routine can result in either an all zero or unknown password. If a device is reset when the password locations are all zeros, the device cannot be unlocked by the password match flow described in Section 1.2.3.2. Using a password of all zeros will seriously limit your ability to debug secure code or reprogram the flash.

根据TRM说明初始是可能读出0000因为为了保护出来的虚拟密码，您可以不用密码直接进入，但是不建议您配置成0000有可能导致IC锁死。

具体说明请参考TRM原文说明

NOTE: Any read of the CSM password would yield 0x0000 until the device is unlocked. These reads are labeled "dummy read" or a "fake read." The application reads the password locations, but will always get 0's no matter what the actual value is. What is important is the actual value of the password. If the actual value is all 0xFFFF, then doing this "dummy read" will unlock the device. If the actual value is all 0x0000, then no matter what the application code does, one will never be able to unlock the device. If the actual value is something other than all 0xFFFF or 0x0000, then when the dummy read is performed, the actual value must match the password the user provided.