CLASS #4: Register and Immediate addressing 100 rrr p00 sss p=0 => rrr <-- sss ; Register addressing { ldr r1, r2 }
p=1 => rrr <-- value ; Immediate (sss ignored) { ldi r, value }
In the case of Immediate addressing (p=1), the operand (value) is given
in the word following the opcode.
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