30.6.2.4.1 Processor Command Registers

The CMD field is part of the host interface and is used to start, stop and reset the pPP. Writing a valid command to this field changes the internal state of the pPP. After a number of cycles, this state change is reflected in the processor state register.

When a START command is issued, the host is no longer able to write to host interface registers which are marked as run-time write-locked. The pPP RAM block is also locked by this command. The host interface registers and RAM block can be unlocked by using the STOP or RESET commands. The lock is released when the processor state register reflects this state.