This document provides an overview of the 8085 microprocessor, including its hardware architecture, functional blocks, registers, arithmetic logic unit, memory organization, I/O ports, pins, and interrupts. It describes the program counter, stack pointer, data bus, address bus, control bus, status signals, flag register, pin descriptions, and serial I/O ports of the 8085 microprocessor.
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.
This presentation discusses the Serial Communication features in 8051, the support for UART. It also discusses serial vs parallel communication, simplex, duplex and full-duplex modes, MAX232, RS232 standards
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.
This presentation discusses the Serial Communication features in 8051, the support for UART. It also discusses serial vs parallel communication, simplex, duplex and full-duplex modes, MAX232, RS232 standards
Presents features of ARM Processors, ARM architecture variants and Processor families. Further presents, ARM v4T architecture, ARM7-TDMI processor: Register organization, pipelining, modes, exception handling, bus architecture, debug architecture and interface signals.
INTRODUCTION
We know that a microprocessor is the CPU of a computer. A microprocessor can perform some operation on a data and give the output. But to perform the operation we need an input to enter the data and an output to display the results of the operation. So we are using a keyboard and monitor as Input and output along with the processor. Microprocessors engineering involves a lot of other concepts and we also interface memory elements like ROM, EPROM to access the memory.
Types of Interfacing
There are two types of interfacing in context of the 8085 processor.
Memory Interfacing.
I/O Interfacing.
Memory Interfacing:
While executing an instruction, there is a necessity for the microprocessor to access memory frequently for reading various instruction codes and data stored in the memory. The interfacing circuit aids in accessing the memory.
Memory requires some signals to read from and write to registers. Similarly the microprocessor transmits some signals for reading or writing a data.
But what is the purpose of interfacing circuit here?
The interfacing process involves matching the memory requirements with the microprocessor signals. The interfacing circuit therefore should be designed in such a way that it matches the memory signal requirements with the signals of the microprocessor. For example for carrying out a READ process, the microprocessor should initiate a read signal which the memory requires to read a data. In simple words, the primary function of a memory interfacing circuit is to aid the microprocessor in reading and writing a data to the given register of a memory chip.
The interfacing process involves matching the memory requirements with the microprocessor signals. The interfacing circuit therefore should be designed in such a way that it matches the memory signal requirements with the signals of the microprocessor. For example for carrying out a READ process, the microprocessor should initiate a read signal which the memory requires to read a data. In simple words, the primary function of a memory interfacing circuit is to aid the microprocessor in reading and writing a data to the given register of a memory chip.
I/O Interfacing:
We know that keyboard and Displays are used as communication channel with outside world. So it is necessary that we interface keyboard and displays with the microprocessor. This is called I/O interfacing. In this type of interfacing we use latches and buffers for interfacing the keyboards and displays with the microprocessor.
But the main disadvantage with this interfacing is that the microprocessor can perform only one function. It functions as an input device if it is connected to buffer and as an output device if it is connected to latch. Thus the capability is very limited in this type of interfacing.
Introduction of Motorola microprocessors
Designers
Motorola microprocessor family
Motorola 6800 Microprocessor Family
Variations of 6800
Motorola 680x0 Microprocessor Family
Motorola PowerPC Family
Features of MC6800 Microprocessor
Memory of MC6800 Microprocessor
Presents features of ARM Processors, ARM architecture variants and Processor families. Further presents, ARM v4T architecture, ARM7-TDMI processor: Register organization, pipelining, modes, exception handling, bus architecture, debug architecture and interface signals.
INTRODUCTION
We know that a microprocessor is the CPU of a computer. A microprocessor can perform some operation on a data and give the output. But to perform the operation we need an input to enter the data and an output to display the results of the operation. So we are using a keyboard and monitor as Input and output along with the processor. Microprocessors engineering involves a lot of other concepts and we also interface memory elements like ROM, EPROM to access the memory.
Types of Interfacing
There are two types of interfacing in context of the 8085 processor.
Memory Interfacing.
I/O Interfacing.
Memory Interfacing:
While executing an instruction, there is a necessity for the microprocessor to access memory frequently for reading various instruction codes and data stored in the memory. The interfacing circuit aids in accessing the memory.
Memory requires some signals to read from and write to registers. Similarly the microprocessor transmits some signals for reading or writing a data.
But what is the purpose of interfacing circuit here?
The interfacing process involves matching the memory requirements with the microprocessor signals. The interfacing circuit therefore should be designed in such a way that it matches the memory signal requirements with the signals of the microprocessor. For example for carrying out a READ process, the microprocessor should initiate a read signal which the memory requires to read a data. In simple words, the primary function of a memory interfacing circuit is to aid the microprocessor in reading and writing a data to the given register of a memory chip.
The interfacing process involves matching the memory requirements with the microprocessor signals. The interfacing circuit therefore should be designed in such a way that it matches the memory signal requirements with the signals of the microprocessor. For example for carrying out a READ process, the microprocessor should initiate a read signal which the memory requires to read a data. In simple words, the primary function of a memory interfacing circuit is to aid the microprocessor in reading and writing a data to the given register of a memory chip.
I/O Interfacing:
We know that keyboard and Displays are used as communication channel with outside world. So it is necessary that we interface keyboard and displays with the microprocessor. This is called I/O interfacing. In this type of interfacing we use latches and buffers for interfacing the keyboards and displays with the microprocessor.
But the main disadvantage with this interfacing is that the microprocessor can perform only one function. It functions as an input device if it is connected to buffer and as an output device if it is connected to latch. Thus the capability is very limited in this type of interfacing.
Introduction of Motorola microprocessors
Designers
Motorola microprocessor family
Motorola 6800 Microprocessor Family
Variations of 6800
Motorola 680x0 Microprocessor Family
Motorola PowerPC Family
Features of MC6800 Microprocessor
Memory of MC6800 Microprocessor
8085 Pin Diagram, Demultiplexing and Generation Of Control Signals
Index::
Introduction of 8085 microprocessor
Logic pinout of 8085 microprocessor
Demultiplexing
Generation of control signals
The Read/Write Control logic interfaces the 8251A with CPU, determines the functions of the 8251A according to the control word written into its control register.
It monitors the data flow.
This section has three registers and they are control register, status register and data buffer.
The active low signals RD, WR, CS and C/D(Low) are used for read/write operations with these three registers.
When C/D(low) is high, the control register is selected for writing control word or reading status word.
When C/D(low) is low, the data buffer is selected for read/write operation.
When the reset is high, it forces 8251A into the idle mode.
The clock input is necessary for 8251A for communication with CPU and this clock does not control either the serial transmission or the reception rate.ThesisScientist.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.
It is very useful for Electrical &Electronics and Electronics and Communication Engineering Students. Here explained the all types of Electrical and Electronics instruments with relevant diagram and Equations
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
Normal Labour/ Stages of Labour/ Mechanism of LabourWasim Ak
Normal labor is also termed spontaneous labor, defined as the natural physiological process through which the fetus, placenta, and membranes are expelled from the uterus through the birth canal at term (37 to 42 weeks
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
This slide is special for master students (MIBS & MIFB) in UUM. Also useful for readers who are interested in the topic of contemporary Islamic banking.
A review of the growth of the Israel Genealogy Research Association Database Collection for the last 12 months. Our collection is now passed the 3 million mark and still growing. See which archives have contributed the most. See the different types of records we have, and which years have had records added. You can also see what we have for the future.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
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It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
4. CPU INTERNAL STRUCTURE
Registers
Six general purpose 8-bit registers: B, C, D, E, H, L.
They can also be combined as register pairs to Perform 16-
bit operations: BC, DE, HL.
Registers are programmable (data load, move, etc.)
Accumulator Single 8-bit register that is part of the ALU !
Used for arithmetic / logic operations – the result is always
stored in the accumulator.
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5. Program Counter (PC)
This is a register that is used to control the sequencing of
the execution of instructions.
This register always holds the address of the next
instruction.
Since it holds an address, it must be 16 bits wide.
Stack Pointer (SP)
The stack pointer is also a 16-bit register that is used to
point into memory.
The memory this register points to is a special area called
the stack.
The stack is an area of memory used to hold data that will
be retreived soon.
The stack is usually accessed in a Last In First Out (LIFO)
fashion.
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6. ARITHMETIC AND LOGIC
UNIT
In addition to the arithmetic & logic circuits, the ALU includes
the accumulator, which is part of every arithmetic & logic
operation.
Also, the ALU includes a temporary register used for holding
data temporarily during the execution of the operation. This
temporary register is not accessible by the programmer.
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7. ACCUMULATOR
A register in which intermediate arithmetic and logic results
are stored.
Example for accumulator use is summing a list of numbers.
The accumulator is initially set to zero, then each
number in turn is added to the value in the accumulator.
Only when all numbers have been added is the result
held in the accumulator written to main memory or to
another, non-accumulator, CPU register.
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8. DATA BUS
The data bus is 'bi-directional'
data or instruction codes from memory or Input/output
are transferred into the microprocessor
the result of an operation or computation is sent out
from the microprocessor to the memory or input/output.
Depending on the particular microprocessor, the data bus
can handle 8 bit or 16 bit data.
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9. ADDRESS BUS
The address bus is 'unidirectional', over which the
microprocessor sends an address code to the memory or
input/output.
The size (width) of the address bus is specified by the
number of bits it can handle.
The more bits there are in the address bus, the more
memory locations a microprocessor can access.
A 16 bit address bus is capable of addressing 65,536 (64K)
addresses.
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10. CONTROL BUS
• The control bus is used by the microprocessor to send out
or receive timing and control signals in order to coordinate
and regulate its operation and to communicate with other
devices, i.e. memory or input/output.
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11. THE CONTROL AND STATUS
SIGNALS
There are 4 main control and status signals. These are:
ALE: Address Latch Enable. This signal is a pulse that
become 1 when the AD0 – AD7 lines have an
address on them. It becomes 0 after that. This signal
can be used to enable a latch to save the address bits
from the AD lines.
RD: Read. Active low.
WR: Write. Active low.
IO/M: This signal specifies whether the operation is
a memory operation (IO/M=0) or an I/O operation
(IO/M=1).
S1 and S0 : Status signals to specify the kind of
operation being performed .Usually un-used in small
systems.
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12. FREQUENCY CONTROL
SIGNALS
There are 3 important pins in the frequency control group.
X0 and X1 are the inputs from the crystal or clock
generating circuit.
The frequency is internally divided by 2.
So, to run the microprocessor at 3 MHz, a clock
running at 6 MHz should be connected to the X0
and X1 pins.
CLK (OUT): An output clock pin to drive the clock of the
rest of the system.
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15. PIN DESCRIPTION
8085 is a 40 pin IC, The signals from the pins can be
grouped as follows
1. Power supply and clock signals
2. Address bus
3. Data bus
4. Control and status signals
5. Interrupts and externally initiated signals
6. Serial I/O ports
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16. POWER SUPPLY AND CLOCK
FREQUENCY SIGNALS
Vcc: + 5 volt power supply
Vss: Ground.
X1, X2 : Crystal or R/C network or LC network connections to
set the frequency of internal clock generator. The frequency is
internally divided by two. Since the basic operating timing
frequency is 3 MHz, a 6 MHz crystal is connected externally.
CLK (output)-Clock Output is used as the system clock for
peripheral and devices interfaced with the microprocessor.
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17. ADDRESS BUS
A8 - A15: (output; 3-state) It carries the most significant 8 bits of the
memory address or the 8 bits of the I/O address.
DATA BUS
• AD0 - AD7 (input/output; 3-state) These multiplexed set of lines used to carry
the lower order 8 bit address as well as data bus.
• During the op code fetch operation, in the first clock cycle, the lines deliver the
lower order address A0 - A7.
• In the subsequent IO / memory, read / write clock cycle the lines are used as
data bus.
• The CPU may read or write out data through these lines.
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18. CONTROL AND STATUS
SIGNALS
ALE (output) - Address Latch Enable.
It is an output signal used to give information of AD0-AD7
contents.
It is a positive going pulse generated when a new operation
is started by uP.
When pulse goes high it indicates that AD0-AD7 are
address.
When it is low it indicates that the contents are data.
RD (output 3-state, active low)
Read memory or IO device.
This indicates that the selected memory location or I/O
device is to be read and that the data bus is ready for
accepting data from the memory or I/O device
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19. WR (Write)
Write memory or IO device.
This indicates that the data on the data bus is to be written
into the selected memory location or I/O device.
IO/M (output) - Select memory or an IO device
This status signal indicates that the read / write operation
relates to whether the memory or I/O device.
It goes high to indicate an I/O operation.
It goes low for memory operations.
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21. INTERRUPTS AND EXTERNALLY
INITIATED OPERATIONS
They are the signals initiated by an external device to request
the microprocessor to do a particular task or work.
There are five hardware interrupts called,
TRAP
RST 7.5
RST 6.5
RST 5.5
INTA
On receipt of an interrupt, the microprocessor acknowledges
the interrupt by the active low INTA (Interrupt Acknowledge)
signal.
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22. Reset In (Input)
This signal is used to reset the microprocessor.
The program counter inside the microprocessor is
set to zero.
The buses are tri-stated.
Reset Out (Output)
It indicates CPU is being reset.
Used to reset all the connected devices when the
microprocessor is reset.
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23. DIRECT MEMORY ACCESS
(DMA)
When 2 or more devices are connected to a common bus,
to prevent the devices from interfering with each other, the
tri state gates are used to disconnect all devices except the
one that is communicating at a given instant.
The CPU controls the data transfer operation between
memory and I/O device. Direct Memory Access operation is
used for large volume data transfer between memory and
an I/O device directly.
The CPU is disabled by tri-stating its buses and the transfer
is effected directly by external control circuits.
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24. HOLD signal is generated by the DMA controller circuit. On
receipt of this signal, the microprocessor acknowledges the
request by sending out
HLDA signal and leaves out the control of the buses. After
the HLDA signal the DMA controller starts the direct
transfer of data.
READY (input)
Memory and I/O devices will have slower response
compared to microprocessors.
Before completing the present job such a slow peripheral
may not be able to handle further data or control signal
from CPU.
The processor sets the READY signal after completing the
present job to access the data.
The microprocessor enters into WAIT state while the READY
pin is disabled.
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25. SINGLE BIT SERIAL I/O
PORTS
SID (input) Serial input data line
SOD (output) Serial output data line
These signals are used for serial communication.
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