4.7.1. Coprocessor Access Control Register

The CPACR register specifies the access privileges for coprocessors. See the register summary in Table 4.58 for its attributes. The bit assignments are:

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Table 4.59. CPACR bit assignments

[31:24]-Reserved. Read as Zero, Write Ignore.
[2n+1:2n] for n values10 and 11CPn

Access privileges for coprocessor n. The possible values of each field are:


Access denied. Any attempted access generates a NOCP UsageFault.


Privileged access only. An unprivileged access generates a NOCP fault.


Reserved. The result of any access is Unpredictable.


Full access.

[19:0]-Reserved. Read as Zero, Write Ignore.

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