ISO/IEC 11889包含受信任平台模块（TPM）命令的定义。这些命令使用ISO/IEC 11889-2中定义的常量、标志、结构和联合定义。 命令操作的详细描述用C语言编写，并附有大量注释。本ISO/IEC 11889-3:2015中C代码的行为是规范性的，但并未完全描述TPM的行为。ISO/IEC 11889-3:2015和ISO/IEC 11889-4的结合足以充分描述TPM的所需行为。 ISO/IEC 11889-3:2015和ISO/IEC 11889- 4用于定义合规TPM的行为。在某些情况下，不可能提供兼容的实现。在这些情况下，供应商提供的满足ISO/IEC 11889本部分功能一般描述的任何实现都将符合要求。

ISO/IEC 11889 contains the definitions of the Trusted Platform Module (TPM) commands. These commands make use of the constants, flags, structures, and union definitions defined in ISO/IEC 11889-2. The detailed description of the operation of the commands is written in the C language with extensive comments. The behavior of the C code in this ISO/IEC 11889-3:2015 is normative but does not fully describe the behavior of a TPM. The combination of this ISO/IEC 11889-3:2015 and ISO/IEC 11889-4 is sufficient to fully describe the required behavior of a TPM. ISO/IEC 11889-3:2015 and ISO/IEC 11889-4 is written to define the behavior of a compliant TPM. In some cases it is not possible to provide a compliant implementation. In those cases, any implementation provided by the vendor that meets the general description of the function provided in this part of ISO/IEC 11889 would be compliant.