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Asked: 2026-06-14T18:17:47+00:00

Reading AVR assembler instruction set documentation. What those red highlighted registers means? In some

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Reading AVR assembler instruction set documentation.

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What those red highlighted registers means? In some cases they are inverted.

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  1. Editorial Team

    R in this case means the result. The formulas give how the flags correspond to the bits of the result. For example N=R7 means bit #7 of the result is copied into the negative flag. Which is what the verbal description says too. You should also know that in those boolean formulas • means AND, + means OR, ⨁ means XOR.

    For your information, the notations used are listed on the first two pages of the manual (at least in the one I have), among others it lists:

    Registers and Operands
Rd:    Destination (and source) register in the Register File
Rr:    Source register in the Register File
R:     Result after instruction is executed
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