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Addressing modes of microprocessor 8086 8086 The way of specifying data to be operated by an instruction is known as  addressing modes . This specifies that the given data is an immediate data or an address. It also specifies whether the given operand is register or register pair. Types of addressing modes: Register mode –  In this type of addressing mode both the operands are registers. Example: MOV AX, BX XOR AX, DX ADD AL, BL Immediate mode –  In this type of addressing mode the source operand is a 8 bit or 16 bit data. Destination operand can never be immediate data. Example: MOV AX, 2000 MOV CL, 0A ADD AL, 45 AND AX, 0000 Note that to initialize the value of segment register an register is required. MOV AX, 2000 MOV CS, AX Displacement or direct mode –  In this type of addressing mode the effective address is directly given in the instruction as displacement. Example: MOV AX, [DISP] MOV AX, [0500] Register indirect mode –  In thi...

Instruction set of microprocessor 8086 The 8086 microprocessor supports 8 types of instructions − Data Transfer Instructions Arithmetic Instructions Bit Manipulation Instructions String Instructions Program Execution Transfer Instructions (Branch & Loop Instructions) Processor Control Instructions Iteration Control Instructions Interrupt Instructions Let us now discuss these instruction sets in detail. Data Transfer Instructions These instructions are used to transfer the data from the source operand to the destination operand. Following are the list of instructions under this group − Instruction to transfer a word MOV  − Used to copy the byte or word from the provided source to the provided destination. PPUSH  − Used to put a word at the top of the stack. POP  − Used to get a word from the top of the stack to the provided location. PUSHA  − Used to put all the registers into the stack. POPA  − Used to get words from the...

Programming model of microprocessor 8085 prograaming modal  chhah saamaany prayojan rajistar 1.8085 mein chhah saamaany prayojan rajistar hote hain jaise b, ch, d, ai, h, l. 2. mote rajistar ko 16-bit opareshan (beesee, de, echel) karane ke lie rajistar jode ke roop mein joda ja sakata hai. sanchayakarta rajistar 1. yah akshar a dvaara pahachaana jaata hai. 2. yah alu ka ek hissa hai. 3. isamen 8-bit deta storej hai. 4. yah ankaganit aur taarkik sanchaalan karata hai. 5. kisee opareshan ka parinaam sanchaayak mein sangraheet kiya jaata hai. dhvaj panjee 1. yah bhee alu ka ek hissa hai 2.8085 mein paanch jhandon ke naam hain -jiro jhanda (z) -kaary dhvaj (chy) -sain phlaig (es) -parivartan dhvaj (p) sahaayak kairee phlaig (esee) 3. in jhande dhvaj rajistar mein paanch phlip-phlop hain. 4. ek ankaganit / tark sanchaalan ka nishpaadan in jhandon ko set ya reeset kar sakata hai. 5. sophtaveyar nirdeshon ke maadhyam se jhande (set ya reeset) ka pareeks...

Addressing modes of microprocessor 8085 The way of specifying data to be operated by an instruction is called addressing Types of addressing modes – In 8085 microprocessor there are 5 types of addressing modes: Immediate Addressing Mode – In immediate addressing mode the source operand is always data. If the data is 8-bit, then the instruction will be of 2 bytes, if the data is of 16-bit then the instruction will be of 3 bytes. Examples: MVI B 45 (move the data 45H immediately to register B) LXI H 3050 (load the H-L pair with the operand 3050H immediately) JMP address (jump to the operand address immediately). Register Addressing Mode – In register addressing mode, the data to be operated is available inside the register(s) and register(s) is(are) operands. Therefore the operation is performed within various registers of the microprocessor. Examples: MOV A, B (move the contents of register B to register A) ADD B (add contents of registers A and B and s...