Each instruction has a one-byte (8-bit) operation codes or opcode. With 8- bit binary opcode, a total of different operation codes can. Opcode sheet for Microprocessor with descriptionMnemonic ACI n ADC r ADC M ADD r ADD M ADI n ANA r ANA M ANI n CALL a CC a CM a CMA CMC. tes. com. Gursharan Singh Tatla. Page 1 of 6. OPCODES TABLE OF INTEL Opcodes of Intel in Alphabetical Order. Sr. No. 1. 2. 3. 4. 5.

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These instructions use bit operands and include indirect loading and storing of a word, a subtraction, a shift, a rotate, and offset operations. Lastly, the carry flag is set if a carry-over from bit 7 of the accumulator the MSB occurred.

instruction set-opcode,operand,size,M-cycle,T-cycle

Input data to accumulator from a port with 8-bit address. An improvement over the is that the can itself drive a piezoelectric crystal directly connected to it, and a built-in clock generator generates the internal high amplitude two-phase clock signals at half the crystal frequency a 6.

Once designed into such products as the DECtape II controller and the VT video terminal in the late s, the served for new production throughout the lifetime of those products. Thanks a lot for sharing!

Load the accumulator indirect. The instruction loads the contents of the H and L registers into the stack pointer register. I would like to opcores while you amend your website, how could i subscribe for a blog site? Also, the architecture and instruction set of the are easy for a student to understand.

The contents of the H register provide the high-order address and the contents of the L register provide the low-order address. Share this on WhatsApp. Since use of these instructions usually relates to specific hardware features, the necessary program modification would typically be nontrivial.


Subtraction and bitwise logical opfodes on 16 bits is done in opcides steps. I am truly thankful to the holder of this web site who has shared this fantastic paragraph at here.

Intel – Wikipedia

The contents of the designated register pair point to a memory location. However, it requires less support circuitry, 88085 simpler and less expensive microcomputer systems to be built. The only 8-bit ALU operations that can have a destination other than the accumulator are the unary incrementation or decrementation instructions, which can operate on any 8-bit register or on memory addressed by HL, as for two-operand 8-bit operations.

The contents of the L register are exchanged with the stack location pointed out by the contents of the stack pointer register. My blg site is in the very same niche as yours and my visitors would certainly benefit frtom some of the information you present here.

Intel 8085

Push the register pair onto the stack. However, an circuit requires an 8-bit address latch, so Intel manufactured several support chips with an address latch built in.

Due to the regular encoding of the MOV instruction using nearly a quarter of the entire opcode space there are redundant codes to copy a register into itself MOV B,Bfor instancewhich are of little use, except for delays.

The zero oocodes is set if the result of the operation was 0. One sophisticated instruction is XTHL, which is used for exchanging the opcoes pair HL with the value stored at the address indicated by the stack pointer.

8085 Data-transfer Instructions

These kits usually include complete documentation allowing a student to go from soldering to assembly language programming in a single course.

The 8-bit data is stored in the destination register or memory. The is a binary compatible follow up on the SIM and RIM also allow the global interrupt mask state and the three independent RST interrupt mask states to be read, the pending-interrupt states of those same three interrupts to be read, the RST 7.


This was typically longer than the product life of desktop computers. That is opcpdes very good tip especially to those fresh to the blogosphere.

Each of these five interrupts has a separate pin oppcodes the processor, a feature which permits simple systems to avoid the cost of a separate interrupt controller. Unlike the it does not multiplex state signals onto the data bus, but the 8-bit data bus is instead multiplexed with the lower 8-bits of the bit address bus to limit the number of pins to The contents of the 80855 location pointed out by the stack pointer register are copied to the low-order register C, E, L, status flags of the operand.

A NOP “no operation” instruction exists, but does not modify any of the registers or flags. All data, control, and address opcides are available on dual pin headers, and a large prototyping area is provided.

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Adding HL to itself performs a bit arithmetical left shift with one instruction. Intel An Intel AH processor. All 2-operand 8-bit arithmetic and logical ALU operations work on the 8-bit accumulator the A register. I have bookmarked it for later! I believe thaat you ought to publish more about this subject, it may not be a taboo subject but usually people do not talk about these topics.

Output the data from the accumulator to a port with 8bit address. Views Read Edit View history.