Cortex-M3 Devices Generic User Guide
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4.3.2. CPUID Base Register

The CPUID register contains the processor part number, version, and implementation information. See the register summary in Table 4.12 for its attributes. The bit assignments are:

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Table 4.14. CPUID register bit assignments

BitsNameFunction
[31:24]Implementer

Implementer code:

0x41 = ARM

[23:20]Variant

Variant number, the r value in the rnpn product revision identifier:

0x2 = Revision 2

[19:16]Constant

Reads as 0xF

[15:4]PartNo

Part number of the processor:

0xC23 = Cortex-M3

[3:0]Revision

Revision number, the p value in the rnpn product revision identifier:

0x0 = Patch 0


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