Here you can download the free lecture Notes of Microprocessor and Microcontroller Pdf Notes – MPMC Notes Pdf materials with multiple file links to download Microprocessor and Microcontroller Notes Pdf – MPMC Pdf Notes book starts with the topics instruction formats, addressing modes, instruction set, assembler directives,macros,overview of 8051 microcontroller,architecture, I/O ports. RISC microprocessor architecture uses highly-optimized set of instructions. It is used in. Microprocessors 13 8085 Microprocessor. Microprocessors 14 8085 is pronounced as 'eighty-eighty-five' microprocessor. It is an 8-bit microprocessor designed by Intel in 1977 using NMOS technology.
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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
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.
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 −
Here you can download the free lecture Notes of Microprocessor and Interfacing Pdf Notes – MPI Notes Pdf materials with multiple file links to download. Microprocessor and Interfacing Notes Pdf – MPI Pdf Notes book starts with the topics Vector interrupt table, Timing diagram, Interrupt structure of 8086. Vector interrupt table.
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Note :- These notes are according to the R09 Syllabus book of JNTU.In R13 and R15,8-units of R09 syllabus are combined into 5-units in R13 and R15 syllabus. If you have any doubts please refer to the JNTU Syllabus Book.
Microprocessor and Interfacing Notes Pdf – MPI Pdf Notes
UNIT-I
An over view of 8085, Architecture of 8086 Microprocessor. Special functions of General purpose registers. 8086 flag register and function of 8086 Flags. Addressing modes of 8086. Instruction set of 8086. Assembler directives, simple programs, procedures, and macros.
UNIT-II
Assembly language programs involving logical, Branch & Call instructions, sorting, evaluation of arithmetic expressions, string manipulation.
UNIT-III
Pin diagram of 8086-Minimum mode and maximum mode of operation. Timing diagram. Memory interfacing to 8086 (Static RAM & EPROM). Need for DMA. DMA data transfer Method and Interfacing with 8237/8257.
UNIT-IV
8255 PPI – various modes of operation and interfacing to 8086. Interfacing Keyboard and Displays, 8279 Stepper Motor and actuators. D/A and A/D converter interfacing.
Microprocessor and Interfacing Notes pdf Details
UNIT-V
Interrupt structure of 8086. Vector interrupt table. Interrupt service routines. Introduction to DOS and BIOS interrupts. 8259 PIC Architecture and interfacing cascading of interrupt controller and its importance.
UNIT-VI
Serial data transfer schemes. Asynchronous and Synchronous data transfer schemes. 8251 USART architecture and interfacing. TTL to RS 232C and RS232C to TTL conversion. Sample program of serial data transfer.IEEE 488 GPIB.
UNIT-VII
Overview of 8051 microcontroller, Architecture, I/O ports and memory organisation, addressing modes and instruction set of 8051, simple programs
UNIT-VIII
Timer/ Counter operation in 8051, serial communication control in 8051 and interrupt structure of 8051, memory and I/O interfacing of 8051.
Reference – Microprocessor and Interfacing Notes – MI notes pdf – MI pdf notes – MI Pdf – MI Notes
Reference – Microprocessor and Interfacing Notes – MI notes pdf – MI pdf notes – MI Pdf – MI Notes
1. Micro Processors & Interfacing – Douglas U. Hall, 2007.
2. The 8088 and 8086 Micro Processors – PHI, 4th Edition, 2003.
3. Micro Computer System 8086/8088 Family Architecture, Programming and Design – By Liu and GA Gibson, PHI, 2nd Ed.,
2. The 8088 and 8086 Micro Processors – PHI, 4th Edition, 2003.
3. Micro Computer System 8086/8088 Family Architecture, Programming and Design – By Liu and GA Gibson, PHI, 2nd Ed.,
Text books – Microprocessor and Interfacing Notes – MI notes pdf – MI pdf notes – MI Pdf – MI Notes
Internal Architecture Of 8085 Microprocessor Pdf
1. Advanced microprocessor and Peripherals – A.K.Ray and K.M.Bhurchandi, TMH, 2000.
2. Micro Controllers –Ajay V.Deshmukh, Tata McGraw Hill Edition.
2. Micro Controllers –Ajay V.Deshmukh, Tata McGraw Hill Edition.
8085 Microprocessor Architecture Pdf Converter
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