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Addressing modes
- 1. Addressing Modes Mr.A.Rameshbabu AP/ECE Ramco Institute of Technology Academic Year 2019 – 2020 Odd
- 2. Addressing Modes Every instruction of a program has to operate on a data. The method of specifying the data to be operated by the instruction is called Addressing. 1. Immediate Addressing 2. Direct Addressing 3. Register Addressing 4. Register Indirect Addressing 5. Implied Addressing 6. Relative Addressing 7. Indexed Addressing
- 3. Immediate Addressing In immediate addressing mode, an 8/16 bit immediate data/constant is specified in the instruction itself. Examples: MOV A, #6CH MOV DPTR, #8050H ADD A, #DATA SUB A, #DATA
- 4. Direct Addressing In Direct addressing mode, the address of the data is directly specified in the instruction. The direct address can be the address of an internal data RAM location (00H to 7FH) or the address of SFR (80H to FFH) Examples: MOV A, 07H MOV Rn, direct ADD A, 55H
- 5. Register Addressing In Register addressing mode, the Instruction specifies the name of the register in which the data is available. Examples: MOV R2, A ADD A, Rn MUL AB DIV AB
- 6. Register Indirect Addressing In Register indirect addressing mode, the instruction specifies the name of the register in which the address of the data is available. The internal RAM locations (00H to 7FH) can be addressed indirectly through register R1 and R0. Examples: MOV A, @R0 MOV @R1, A ADD A, @Ri INC @Ri
- 7. Implied Addressing In Implied addressing mode, the Instruction itself specifies the data to be operated. Examples: CPL C CLR C DAA
- 8. Relative Addressing In Relative addressing mode, the Instruction specifies the address relative to the program counter. The instruction will carry an offset whose range is -128 to +127 The offset is added to the Program Counter Examples: JC offset SJMP offset JNC offset
- 9. Indexed Addressing In Indexed addressing mode, only the program memory can be accessed and it can only be read. Examples: MOVC A, @A+PC MOVC A, @A+DPTR JMP @A+DPTR