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by pm215
1072 days ago
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Tangent: some Arm Cortex-M class CPUs had a feature called "bit-banding" where you could do byte accesses to an area of the address map and the CPU would turn these into bit accesses to a different part of memory. So the alias word at 0x23FFFFFC maps to bit [7] of the byte at of RAM at 0x200FFFFF, for example, and you can do a word write to 0x23FFFFFC to change just that bit 7, saving having to do it by hand (which is particularly awkward if you need to ensure the atomicity of the bit update). https://developer.arm.com/documentation/100165/0201/Programm... |
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