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Articles on Trending Technologies
Technical articles with clear explanations and examples
Interfacing 8279 Keyboard with 8085 Microprocessor
Here we will see how 8279 Chip can be used to interface a matrix keyboard with 8085 microprocessors. This chip can be used either keyboard/display interfacing mode or as a strobed input port. But generally, it is used as keyboard interfacing.The keyboard interfacing schemes can also be divided into two modes. These modes are Decoded mode of operationEncoded mode of operationDecoded Mode of OperationIn this mode, the matrix keyboard can have only four rows. These four rows can be selected by using SL3-0 select lines. There are eight columns. These can be selected using RL7-0 these eight column lines. So there are ...
Read MoreInterfacing 8279 Display with 8085 Microprocessor
The Intel 8279 is used for keyboard interfacing but it can also be used for multiplexed 7-segment LED display interfacing. To display a character into 7-segment display we have to store 7-segment code in a display RAM location. The display RAM of this chip can store 16 bytes of data.Write to Display RAMTo write to the display RAM one special command is needed to be applied on the 8279 control port. The following pattern is showing the RAM command that is written to the control port of 8279.100AiAAAAThe first three bits are 100. It indicates ‘ Write to Display RAM’command. ...
Read MoreInterrupt handing in 8051
As we have seen there are five different interrupts in 8051. These interrupts are INT0, INT1, TO, T1, TI/RI.There are six states in each machine cycle. These states are S1 to S6. All of the interrupts are sampled at the end of state S5 of each machine cycle. When the instruction takes more than one machine cycle, then the samples are polled during the next machine cycle. When an interrupt flag is set at the S5 of the first machine cycle, then the polling cycle will find it. The interrupt system generates LCALL instruction to call appropriate ISS.There are some ...
Read MoreInterfacing 8251 USART with 8085 Microprocessor
The 8251 chip is Universal Synchronous Asynchronous Receiver Transmitter (USART). It acts as a mediator between the microprocessor and peripheral devices. It converts serial data to parallel form and vice versa. This chip is 28 pin DIP.The pin description of 8251A chipPinDescriptionD0 - D7parallel dataC/DControl register or Data buffer selectRDRead ControlWRWrite controlCSChip SelectCLKclock pulseRESETResetTxCTransmitter ClockTxDtransmitted dataRxCReceiver ClockRxDReceiver DataRxRDYReceiver ReadyTxRDYTransmitter ReadyDSRData Set ReadyDTRData Terminal ReadySYNDET/Synchronous Detect/BRKDETDetectBreakRTSRequest to send DataCTSClear to send DataTxEMPTYTransmitter EmptyVccVcc (5V)GNDGround(0V)Now let us see the functional block diagram of the 8251 chip.There are five different sections in this diagram. These sections are as follows −Read/ Write control logicTransmitter ReceiverData Bus ...
Read MoreWhat is Happiness Planner/Journal? How to use a happiness journal?
The Happiness Planner / Journal is a planner designed to help you make a habit of listing down the events of our life which give us happiness. It can help us in embracing the power of positive thinking, gratitude, and thanking for the positive events of your life. The Happiness journal helps us to increase positive attitude towards life and fills us with self-awareness and feeling contended from within.A happiness journal is a record of the things that make you happy every day, it is like a list of things that made you happy today or yesterday or day before ...
Read MoreWhat are the Computer science engineering government jobs?
There are many openings for CSE and IT engineering graduates in the Indian Government sector. Here is the list of Major IT Organizations in Government of India which have openings every year for fresh engineering graduates.Centre for Development of Advanced Computing (CDAC), ONGC(Oil and Natural Gas Corporation)GAIL(Gas Authority India Ltd )National Informatics Centre (NIC)HAL (Hindustan Aeronautics LimitedEducation and Research Network (ERNET India)Software Technology Parks of India (STPI)SAIL(Steel Authority of India)DRDO (Defence Research and Development Organization)MECON limitedBARC - Bhabha Atomic Research Centre ( BARC )MECL - Mineral Exploration Corporation LimitedECIL - Electronics Corporation of India LimitedFCI - Food Corporation of IndiaCDAC ...
Read MoreWhat to do to become an interpreter?
An Interpreter or a Professional translator is a very good career. There are some basic requirements to become one.You need to be a graduate to become an Interpreter.Should be fluent in at least 2 languagesYou can attend formal Interpreter training and attain some kind of certification which is optional.Strong communication skills i.e., fluent speaking skills and excellent listening skills are a must to become an Interpreter.
Read MoreEI and DI instructions in 8085
In 8085 is having five internal interrupt signals that correspond to the five external interrupt pins. And these interrupts are only recognized only when the internal interrupt signal is activated, the 8085 gets interrupted, provided higher priority internal interrupt signals are not active at the same time. The 8085 checks all these internal interrupt signals in the penultimate clock cycle of the last machine cycle of instruction.With in 8085, there is a flip-flop called IE flip-flop. Here IE stands for Interrupt Enable. 8085 interrupt system is disabled whenever this flip-flop is reset to the 0 states. That is, even if ...
Read MoreSIM and RIM instructions in 8085
In 8085 Instruction set, SIM (Set Interrupt Mask) and RIM (Read Interrupt Mask) instructions can perform mask and unmask RST7.5, RST6.5, and RST5.5 interrupt pins and can also read their status. In 8085 Instruction set, SIM stands for “Set Interrupt Mask”. It is 1-Byte instruction and it is a multi-purpose instruction. The main uses of SIM instruction are –Masking/unmasking of RST7.5, RST6.5, and RST5.5Reset to 0 RST7.5 flip-flopPerform serial output of dataMnemonics, OperandOpcode(in HEX)BytesSIM301When SIM instruction is executed then the content of the Accumulator decides the action to be taken. So before executing the SIM instruction, it is mandatory to initialize ...
Read MoreWorld's oldest message in a bottle!!
In the era of Super Smartphones and jet speed internet, it is difficult to imagine how people used to send messages to each other from one corner of the world to another.The earlier courier services in the world date back to Roman Empire run by Augustus in the 1st century itself. We can imagine those services would take days and months to be handed over on road and water by a special messenger personally handing over the message.Imagine a message reaching after 132 years!!!Recently a message was found inside of a bottle on an Australian beach, which is dating back ...
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