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Appendix 4.

Notes for Register R/W

● A secure bus master issues a secure access using an address marked as secure by IDAU/SAU or MSAU

● A secure bus master issues a non-secure access using an address marked as non-secure by IDAU/SAU or MSAU

● A non-secure bus master issues a non-secure access using an address marked as non-secure by IDAU/SAU or MSAU.

Table A4.1

Type of register notes (S-TYPE)

TYPE

UM description

S-TYPE-1 Only Secure access can write to this register. Read access is always allowed.

Non-secure write access is ignored, but TrustZone access error is not generated.

S-TYPE-2 Read access is always allowed

If the security attribution is configured as Secure:

● Secure write access is allowed

● Non-secure write access is ignored, but TrustZone access error is not generated.

If the security attribution is configured as Non-secure:

● Secure write access is ignored, but TrustZone access error is not generated

● Non-secure access is allowed.

S-TYPE-3 If the security attribution is configured as Secure:

● Secure access is allowed

● Non-secure write access is ignored and Non-secure read access is read as 0, TrustZone access error is generated.

If the security attribution is configured as Non-secure:

● Secure write access is ignored and Secure read access is read as 0, TrustZone access error is generated

● Non-secure access is allowed.

S-TYPE-4 If the security attribution is configured as Secure:

● Secure access is allowed

● Non-secure write access is ignored and Non-secure read access is read as 0, but TrustZone access error is not

generated.

If the security attribution is configured as Non-secure:

● Secure write access is ignored and Secure read access is read as 0, but TrustZone access error is not generated

● Non-secure access is allowed.

S-TYPE-5 Access is always allowed.

S-TYPE-6 Secure access is allowed.

Non-secure write access is ignored, and Non-secure read access is read as 0, TrustZone access error is generated.

S-TYPE-7 Secure write access is ignored, and Secure read access is read as 0, TrustZone access error is generated.

Non-secure access is allowed.

Note:

A non-secure bus master does NOT issue any access using an address marked as secure by IDAU/SAU or MSAU.

Table A4.2

Type of register notes (P-TYPE)

TYPE

UM description

P-TYPE-1 Privileged write access is allowed. Read access is always allowed.

Unprivileged write access is ignored, but TrustZone access error is not generated.

P-TYPE-2 Privileged access is allowed.

Unprivileged write access is ignored, and Unprivileged read access is read as 0, TrustZone access error is generated.

P-TYPE-3 If the privilege attribution is configured as Privileged:

● Privileged access is allowed

● Unprivileged write access is ignored and Unprivileged read access is read as 0, TrustZone access error is generated.

If the privilege attribution is configured as Unprivilege:

● Privileged access and Unprivileged access are allowed.

P-TYPE-4 If the privilege attribution is configured as Privileged:

● Privileged access is allowed

● Unprivileged write access is ignored and Unprivileged read access is read as 0, TrustZone access error is not generated.

If the privilege attribution is configured as Unprivilege:

● Privileged access and Unprivileged access are allowed.

P-TYPE-5 Access is always allowed.

RA8M2 Datasheet

Appendix 4. Notes for Register R/W

R01DS0438EJ0130 Rev.1.30

Feb 27, 2026

Page 290 of 295

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