To understand the basic concepts of 8085 microprocessor, microcontroller. The students will also learn about the programming methods and integration of peripherals to the micro-controller.
this is the brief description of the 8085 microprocessor. in this ppt, I described the key features of 8085, architecture, pin diagram, interfacing, timing diagram, some program, etc. I have also discussed the memory interfacing of 8085 microprocessor.
The 8085 is based on von Neumann design. It is designed by using NMOS technology. The “5” in the model number came from the fact that the 8085 requires only a +5 V power supply, rather than requiring the +5 V, -5 V and +12 V supplies the 8080 needed. It has 8 bit data bus and 16 bit address bus. It has 8 bit data bus and 16 bit address bus. It can work up to 5 MHz frequency. It has 40 pins in its chip. Lower order address bus is multiplexed with data bus to minimize the chip size
To understand the basic concepts of 8085 microprocessor, microcontroller. The students will also learn about the programming methods and integration of peripherals to the micro-controller.
this is the brief description of the 8085 microprocessor. in this ppt, I described the key features of 8085, architecture, pin diagram, interfacing, timing diagram, some program, etc. I have also discussed the memory interfacing of 8085 microprocessor.
The 8085 is based on von Neumann design. It is designed by using NMOS technology. The “5” in the model number came from the fact that the 8085 requires only a +5 V power supply, rather than requiring the +5 V, -5 V and +12 V supplies the 8080 needed. It has 8 bit data bus and 16 bit address bus. It has 8 bit data bus and 16 bit address bus. It can work up to 5 MHz frequency. It has 40 pins in its chip. Lower order address bus is multiplexed with data bus to minimize the chip size
FPGA are a special form of Programmable logic devices(PLDs) with higher densities as compared to custom ICs and capable of implementing functionality in a short period of time using computer aided design (CAD) software....by mathewsubin3388@gmail.com
The microprocessor is the central processing unit of a computer. It is the heart of the computer. 8085 is one of the most popular 8-Bit microprocessors in India. Because of its unique characteristics of both industry and academics still regarded as standard this microprocessor.
1. 8-Bit Microprocessor:
The 8085 is an 8-bit microprocessor, which means it can process data in 8-bit chunks at a time. This restricts the processor to working with values from 0 to 255.
2. Architecture:
The 8085 microprocessor has a simple architecture consisting of various registers, a control unit, and an arithmetic logic unit (ALU).
It has 74 instructions and 246 opcodes.
3. Registers:
Accumulator (A): Used for performing arithmetic and logic operations.
General-Purpose Registers (B, C, D, E, H, L): Used for various data manipulation tasks.
Stack Pointer (SP): Used to manage the stack.
Program Counter (PC): Keeps track of the address of the next instruction to be executed.
4. Memory:
The 8085 microprocessor can address up to 64KB of memory, which includes RAM (Random Access Memory) and ROM (Read-Only Memory).
Memory is organized into 16-bit addresses.
5. Data and Address Bus:
The 8085 has an 8-bit data bus and a 16-bit address bus, allowing it to communicate with external memory and peripheral devices.7. Instruction Set:
The 8085 uses a Reduced Instruction Set Computer (RISC) architecture with a relatively small instruction set. Instructions are categorized into data transfer, arithmetic and logical operations, control flow, and input/output operations.
8. Addressing Modes:
The 8085 supports various addressing modes, such as direct addressing, immediate addressing, register indirect addressing, and more, allowing for flexible data manipulation.
9. Interrupts:
The 8085 microprocessor features five interrupt lines, which are used for handling external interrupts. It supports both maskable and non-maskable interrupts.
10. Flags:7. Instruction Set:
The 8085 uses a Reduced Instruction Set Computer (RISC) architecture with a relatively small instruction set. Instructions are categorized into data transfer, arithmetic and logical operations, control flow, and input/output operations.
8. Addressing Modes:
The 8085 supports various addressing modes, such as direct addressing, immediate addressing, register indirect addressing, and more, allowing for flexible data manipulation.
9. Interrupts:
The 8085 microprocessor features five interrupt lines, which are used for handling external interrupts. It supports both maskable and non-maskable interrupts.
10. Flags:7. Instruction Set:
The 8085 uses a Reduced Instruction Set Computer (RISC) architecture with a relatively small instruction set. Instructions are categorized into data transfer, arithmetic and logical operations, control flow, and input/output operations.
8. Addressing Modes:
The 8085 supports various addressing modes, such as direct addressing, immediate addressing, register indirect addressing, and more, allowing for flexible data manipulation.
9. Interrupts:
The 8085 microprocessor features five interrupt lines, which are used for handling external interrupts. It supports both maskable and non-maskable interrupts.
10. Flags:7. Instruction Set:
The 8085 uses a Reduced Instruction
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3. ALU
The ALU performs the arithmetic and logical
operations. The operations performed by ALU
of 8085 are addition, subtraction, increment,
decrement, logical AND, OR, EXCLUSIVE -OR,
compare, complement and left / right shift .
4. Accumulator and
temporary register
• The accumulator and temporary register are
used to hold the data during an arithmetic /
logical operation. After an operation the
result is stored in the accumulator and the
flags are set or reset according to the result of
the operation.
5. TIMING & CONTROL UNIT
The timing and control unit synchronizes all the
microprocessor operations with the clock and
generates the control signals necessary for
communication between the microprocessor
and peripherals.
6. INSTRUCTION REGISTER &
DECODER
• When an instruction is fetched from memory it is
placed in instruction register. Then it is decoded
and encoded into various machine cycles.
7. STACK POINTER (SP)
• It is also a 16-bit register which is used as a
memory pointer.
• It maintains the address of the last byte that is
entered into stack.
8. PROGRAM COUNTER (PC)
• The program counter (PC) keeps track of
program execution.
• It is a special purpose register.
• A program counter stores the address of the
next instruction to be executed.
9. FLAG REGISTER
There are five flags in 8085, which are sign flag
(8), zero flag (Z), auxiliary carry flag (AC), parity
flag (P) and carry flag (CY). The bit positions
reserved for these flags in the flag register are
shown in figure below.
10. The Flags register
• There is also a flag register whose bits are affected by
the arithmetic & logic operations.
• S-sign flag
• The sign flag is set if bit D7 of the accumulator
is set after an arithmetic or logic operation.
• Z-zero flag
• Set if the result of the ALU operation is 0.
Otherwise is reset. This flag is affected by
operations on the accumulator as well as other
registers. (DCR B).
• AC-Auxiliary Carry
• This flag is set when a carry is generated from
bit D3 and passed to D4 . This flag is used only
internally for BCD operations.
11. .
• P-Parity flag
• After an ALU operation, if the result has an even #
of 1s, the p-flag is set. Otherwise it is cleared. So,
the flag can be used to indicate even parity.
• CY-carry flag
• This flag is set when a carry is generated from bit
D7 after an unsigned operation.
• OV-Overflow flag
• This flag is set when an overflow occurs after a
signed operation.
Unspecified
7 6 5 4 3 2 1 0SF ZF X AF X PF X CF
12. General Purpose
Registers
• 8085 consists of 6 special types of registers called
General Purpose Registers. These General
Purpose Registers are used to hold data like any
other registers .
• The GPR in 8085 processors are B,C,D,E,H,L.Each
registers can hold 8-bit data.
• They can work in pair such as B-C,D-E,H-L to store
16-bit data.
13. Temporary Register
This register acts as a temporary memory during
the arithmetic and logical operations.
Unlike other registers, this temporary registers
can only be accessed by the microprocessor and
it is completely inaccessible to programmers.
Temporary register is an 8-bit register.
14. PSW
• The combination of these 8-bits is called
Program Status Word(PSW).PSW and the
accumulator as a 16-bit unit for the stack
operation.