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ARM Cortex-M3 Processor Technical Reference Manual Revision r2p1
https://developer.arm.com/documentation/100165/0201/System-Control/CPUID-Base-Register--CPUID
0xC24
Arm Cortex-M4 Processor Technical Reference Manual Revision r0p1
https://developer.arm.com/documentation/100166/0001/System-Control/CPUID-Base-Register--CPUID
it's the same
From the manual:"Feedback on this manualIf you have comments on content then send e-mail to errata@arm.com. Give:• the title• the number, ARM DDI 0337I• the page number(s) to which your comments refer• a concise explanation of your comments."