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Register D is made up of registers A & B. Register A is the most significant part of D and register B is the least significant part of D. Changing D can change both A and B and vice versa. Since register D is a 16-bit register, a two byte operand is required.
The instruction, LDD #$1058, loads a 10 hex into register A and a 58 hex into register B.
Some examples of opcodes that use immediate addressing are:
CC ( LDD)