- Download Opcode Sheet For 8085 Microprocessor Download
- Microprocessor 8085 Pdf Download
- Download Opcode Sheet For 8085 Microprocessor Software
In addition to OPCODE 8085 MICROPROCESSOR SHEET PDF the Java Virtual Machine that is essential to perform certain Java-based program Microprocessor 8085 by b.ram pdf free download types, Java Development Kit has a wide range of tools such as javac, the Java bytecode compiler, javap, disassembler class, and jdb, which is a debugger. Opcode sheet for 8085 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 CMP. Scribd is the world's largest social reading and publishing site. OPCODES TABLE OF INTEL 8085 Opcodes of Intel 8085 in Alphabetical Order Sr. Mnemonics, Operand Opcode Bytes 1. ACI Data CE 2 2. ADC A 8F 1 3. ADC B 88 1 4. ADC C 89 1 5. ADC D 8A 1 6. ADC E 8B 1 7. ADC H 8C 1 8. ADC L 8D 1 9. ADC M 8E 1 10. ADD A 87 1 11. ADD B 80 1 12. ADD C 81 1 13. ADD D 82 1 14.
- Microprocessor Tutorial
- 8085 Microprocessor
- 8086 Microprocessor
- Multiprocessor Configuration
- I/O Interfacing
- Microcontrollers
- Peripheral Devices
- Microprocessor Useful Resources
- Selected Reading
8085 is pronounced as 'eighty-eighty-five' microprocessor. It is an 8-bit microprocessor designed by Intel in 1977 using NMOS technology.
It has the following configuration −
- 8-bit data bus
- 16-bit address bus, which can address upto 64KB
- A 16-bit program counter
- A 16-bit stack pointer
- Six 8-bit registers arranged in pairs: BC, DE, HL
- Requires +5V supply to operate at 3.2 MHZ single phase clock
It is used in washing machines, microwave ovens, mobile phones, etc.
8085 Microprocessor – Functional Units
8085 consists of the following functional units −
Accumulator
It is an 8-bit register used to perform arithmetic, logical, I/O & LOAD/STORE operations. It is connected to internal data bus & ALU.
Arithmetic and logic unit
As the name suggests, it performs arithmetic and logical operations like Addition, Subtraction, AND, OR, etc. on 8-bit data.
General purpose register
There are 6 general purpose registers in 8085 processor, i.e. B, C, D, E, H & L. Each register can hold 8-bit data.
These registers can work in pair to hold 16-bit data and their pairing combination is like B-C, D-E & H-L.
Program counter
Download Opcode Sheet For 8085 Microprocessor Download
It is a 16-bit register used to store the memory address location of the next instruction to be executed. Microprocessor increments the program whenever an instruction is being executed, so that the program counter points to the memory address of the next instruction that is going to be executed.
Stack pointer
It is also a 16-bit register works like stack, which is always incremented/decremented by 2 during push & pop operations.
Microprocessor 8085 Pdf Download
Temporary register
It is an 8-bit register, which holds the temporary data of arithmetic and logical operations.
Flag register
It is an 8-bit register having five 1-bit flip-flops, which holds either 0 or 1 depending upon the result stored in the accumulator.
These are the set of 5 flip-flops −
- Sign (S)
- Zero (Z)
- Auxiliary Carry (AC)
- Parity (P)
- Carry (C)
Its bit position is shown in the following table −
D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 |
---|---|---|---|---|---|---|---|
S | Z | AC | P | CY |
Instruction register and decoder
It is an 8-bit register. When an instruction is fetched from memory then it is stored in the Instruction register. Instruction decoder decodes the information present in the Instruction register.
Timing and control unit
It provides timing and control signal to the microprocessor to perform operations. Following are the timing and control signals, which control external and internal circuits −
- Control Signals: READY, RD’, WR’, ALE
- Status Signals: S0, S1, IO/M’
- DMA Signals: HOLD, HLDA
- RESET Signals: RESET IN, RESET OUT
Interrupt control
As the name suggests it controls the interrupts during a process. When a microprocessor is executing a main program and whenever an interrupt occurs, the microprocessor shifts the control from the main program to process the incoming request. After the request is completed, the control goes back to the main program.
There are 5 interrupt signals in 8085 microprocessor: INTR, RST 7.5, RST 6.5, RST 5.5, TRAP.
Serial Input/output control
It controls the serial data communication by using these two instructions: SID (Serial input data) and SOD (Serial output data).
Address buffer and address-data buffer
The content stored in the stack pointer and program counter is loaded into the address buffer and address-data buffer to communicate with the CPU. The memory and I/O chips are connected to these buses; the CPU can exchange the desired data with the memory and I/O chips.
Address bus and data bus
Data bus carries the data to be stored. It is bidirectional, whereas address bus carries the location to where it should be stored and it is unidirectional. It is used to transfer the data & Address I/O devices.
8085 Architecture
We have tried to depict the architecture of 8085 with this following image −
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Download Opcode Sheet For 8085 Microprocessor Software
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