General Device Commands

The following table provides a summary of the general device commands:

Table 1. General Device Commands
Command Name	Opcode	Description
`Counter`	0x24	Increments and reads the monotonic counters.
`Info`	0x30	Used to read revision and status information from the device.
`Lock`	0x17	Used to lock the individual lockable slots in the device.
`Nonce`	0x16	Used to generate or pass a number used once into the device.
`Random`	0x1B	Used to generate a 32-byte random number used by the system.
`Read`	0x02	Used to read various zones of the device.
`SelfTest`	0x77	Tests the various internal cryptographic computation elements.
`SHA`	0x47	Computes a SHA-256 or HMAC digest for general purpose use by the system.
`UpdateExtra`	0x20	Updates bytes 84 or 85 within the Configuration zone after the Configuration zone is locked.
`Write`	0x12	Used to write 4 or 32 bytes to the device, with or without authentication and encryption.