Intel 8085 mp
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Introduction to 8085 microprocessor, details and commands for programming
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Intel 8085 mp
- 3. 3 Signals and I/O Pins
- 5. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Accumulator (A) Flag B C D E H L Programme Counter(PC) Stack Pointer(SP) Sign Flag(S) Zero Flag(Z) X Auxiliary Carry Flag(AC) X Parity Flag(P) X Carry Flag(C) 7 6 5 4 3 2 1 0 Intel 8085 microprocessor has following registers One 8-bit accumulator(ACC);register A Six 8-bit GPR;B,C,D,E,H,L One 16-bit Stack pointer; SP One 16-bit programme counter; PC Instruction register and Temporary register
- 6. Instruction Set of 8085 • An instruction is a command given to the microprocessor to perform a specified operation on given data. • An instruction contain two part: operational code(opcode) and operand. • The first part of the instruction which specifies the task to be performed by microprocessor is called opcode. • The second part of the instruction is the data to be operated on and it is called operand. Operand may be 8-bit or 16-bit data, 8-bit or 16-bit address, internal registers or a register or memory location. Opcode Operand
- 7. Classification of Instruction Set • Data Transfer Instruction • Arithmetic Instructions • Logical Instructions • Branching Instructions • Control Instructions
- 8. Data Transfer Instruction • MOV B,A • MVI C,45H 23 6A B A 7D C 45 Opcode Operand Description MOV Rd, Rs M, Rs Rd, M Copy from source to destination. Opcode Operand Description MVI Rd, Data M, Data Move immediate 8-bit 6A
- 9. Opcode Operand Description LXI Rp, data [16-bit] Move immediate 16-bit data to the register pair [rh]=8-MSB, [rl]=8-LSB 45 3D B C LXI B, 1432 H 14 32 Opcode Operand Description LDA Address[16-bit] Store accumulator LDA 1432 H 45 A 2B 1431 68 1432 4E 1433 68
- 10. Opcode Operand Description STA Address[16-bit] Store accumulator STA 4150H 45 A 23 E3 6D 414F 4150 4151 45 Opcode Operand Description LHLD Address[16-bit] Load [H-L] pair direct LHLD 4409 H A0 H 23 E3 6D 4408 4409 440A D2 L 6D E3
- 11. Opcode Operand Description SHLD Address[16-bit] Store [H-L] pair direct SHLD 4409 H A0 H 23 E3 6D 4408 4409 440A D2 L A0 D2 Opcode Operand Description XCHG Exchange the contents of[H-L] with [D-E] pair A0 H D2 L 78 D 9E E XCHG
- 12. Direct Access from Memory H-L register pair is known as memory pointer 45 3D H L LXI H, 1432 H 14 32 MOV D,M 95 2B 1431 68 1432 4E 1433 D 68
- 13. Arithmetic Instruction Opcode Operand Description ADD R M Add register with accumulator ADD B 19 A 32 B 19+32=4B 4B ADD M 14 32 H L 2B 1431 68 1432 4E 1433 4B A 4B+68=B3 B3 Opcode Operand Description ADI Data[8-bit] Add immediate data[8-bit] with accumulator ADI 34H B3 A B3+34=E7E7
- 14. Opcode Operand Description ADC r M Add register with carry accumulator ADC B 19 A 32 B 19+32+1=4C CF 1 4C Opcode Operand Description ACI Data[8-bit] Add with carry immediate data to accumulator ACI 25H 19 A 19+25+1=3F CF 1 3F Opcode Operand Description DAD rp Add register pair with [H-L] pair 30 28 2A 36 30+2A+0=5A 28+36=5E H L B C DAD B 5A 5E
- 15. Arithmetic Instruction Opcode Operand Description SUB R M Subtract register from accumulator SUB B 32 A 18 B 32-18=1A 1A SUB M 14 32 H L 2B 1431 68 1432 4E 1433 72 A 72-68=0A0A Opcode Operand Description SUI Data[8-bit] Subtract immediate data[8-bit] from accumulator SUI 04H 18 A 18-04=14 14
- 16. Opcode Operand Description SBB r M Subtract register from accumulator with borrow SBB B 32 A 0B B 32-0B-0=27 CF 0 27 Opcode Operand Description SBI Data[8-bit] Subtract immediate data from accumulator with borrow SBI 0EH 19 A 19-0E-1=0A CF 1 0A
- 17. Opcode Operand Description INR r M Increment register content INR B 0B B 0B+1=0C 0C Opcode Operand Description DCR r M Decrement register content DCR B 0B B 0B-1=0A 0A Opcode Operand Description INX rp Increment the content of register pair INX B FF B 12FF+1=130012 C 00 Opcode Operand Description DCX Rp Decrement the content of register pair DCX B FF B 12FF-1=12FE12 C FE 13
- 18. Logical Instruction Opcode Operand Description ANA r M AND register with accumulator ANA L 0B L 0B 0 0 0 0 1 0 1 1 1E 0 0 0 1 1 1 1 0 0A 0 0 0 0 1 0 1 0 1E A 0A Opcode Operand Description ANI Data[8-bit] AND immediate data with accumulator ANI 0B 0B 0 0 0 0 1 0 1 1 1E 0 0 0 1 1 1 1 0 0A 0 0 0 0 1 0 1 0 1E A 0A
- 19. Opcode Operand Description ORA r M OR register with accumulator ORI Data[8-bit] OR immediate data with accumulator XRA r M EXCLUSIVE-OR register with accumulator XRI Data[8-bit] EXCLUSIVE-OR immediate data with accumulator CMC Compliment the carry status STC Set carry status CMA Complement the accumulator CMA 2B 0 0 1 0 1 0 1 1 D4 1 1 0 1 0 1 0 0 2B A D4
- 20. Branch Instruction Opcode Operand Description JC address[16-bit] Jump immediate address if CF=1 324B 41FF xxx 4200 xxxxx 4201 xxxxxx 4202 xxxxxx PC 1 CF 324A xx 324B JC 4200 324E xxxxxx 324F xxxxxx 4200 Opcode Operand Description JNC address[16-bit] Jump immediate address if CF=0 JZ address[16-bit] Jump immediate address if ZF=1 JNZ address[16-bit] Jump immediate address if ZF=0 JP address[16-bit] Jump immediate address if SF=0 JM address[16-bit] Jump immediate address if SF=1 JPE address[16-bit] Jump immediate address if PF=1 JPO address[16-bit] Jump immediate address if PF=0
- 21. Machine Control Instruction Opcode Operand Description HLT Stop the execution of instruction in the microprocessor NOP No operation IN Port-address Input to accumulator from I/O port OUT Port-address Output from accumulator from I/O port
- 22. Place 05 in the accumulator. Increment it by one and store the result in the memory location 4150 H Memory Address 4100 4102 4103 4106 Machine Code 3E,05 3C 32,50,41 76 Mnemonics MVI INR STA HLT Operands A,05 A 4150 Comments Get 05 in the ACC Inc the content of Acc Store the result in 4150 H Halt 55 414F 23 4150 45 4151 E2 4152 94 A 0506 06