Addressing modes

 The different methods (modes) to select (address) the OPERANDS are called the ADDRESSING MODES.

For 8085,they are:-

※ IMMEDIATE ADDRESSING MODE

※ REGISTER ADDRESSING MODE

※ INDIRECT ADDRESSING MODE

※ IMPLIED ADDRESSING MODE

※ DIRECT ADDRESSING MODE

◎  IMMEDIATE ADDRESSING MODE

● In immediate addressing mode the data (8 / 16 bit) is specified in the instruction itself.

● The immediate addressing instructions are either 2 byte or 3 byte long.

● In 2 byte instruction first byte is OPCODE and second byte is the 8 bit data.

● In 3 byte instructions first byte is OPCODE , second and third bytes are the 16 bit data.

●  The instructions containing the letter "I" indicate immediate addressing mode.

INSTUCTION

OPCODE	OPERAND

Examples:-

i) MVI A,34 H:→This instruction transfers immediate data ( 34 H) to A register.

ii) LXI H,C200H:→This instruction transfers 16 bit immediate data C200 to HL regisrer pair. Lower order data ( 00 H) to L register and high order data ( C2 H ) to H register