This register allows you to identify the currently executing process in multi-tasking environments using the real-time trace tools.

The contents of this register are replicated on the ETMPROCID pins of the ARM946E-S.

The following ARM instructions are used for accessing the Process ID register:

MRC p15, 0, rd, c13, c1, 1; read process ID register

MCR p15, 0, rd, c13, c1, 1; write process ID register

The format of the register, rd, transferred during these operations is shown in Figure 2.4.