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4.3.8. CP15 c1 register summary

Table 4.8 shows the CP15 registers you can access when CRn is c1.

Table 4.8. c1 system control registers
Op1CRmOp2Name TypeReset Description
0c00

SCTLR

RW-[a]

System Control Register

1

ACTLR[b]

RW0x00000000

Auxiliary Control Register

2

CPACR

RW

[c]

Coprocessor Access Control Register

c10SCR[d]RW0x00000000Secure Configuration Register
1SDERcRW0x00000000Secure Debug Enable Register
2NSACRRW[e][f]Non-secure Access Control Register
3VCRcRW0x00000000Virtualization Control Register

[a] Depends on input signals. See System Control Register.

[b] RO in Non-secure state if NSACR[18]=0 and RW if NSACR[18]=1.

[c] 0x00000000 if NEON present and 0xC0000000 if NEON not present or powered down.

[d] No access in Non-secure state.

[e] This is a read and write register in Secure state and a read-only register in the Non-secure state.

[f] 0x00000000 if NEON present and 0x0000C000 if NEON not present..