Memory Interfacing In 8085 Microprocessor Pdf
The section contains MCQs on semiconductor memory, dynamic RAM and I/O port interfacing, interfacing of analog to digital data converters and vice versa, operation and stepper motor interfacing of 8255.
Memory Interfacing In 8085 Microprocessor Pdf
var cid = '7377982948';var pid = 'ca-pub-5687382078590987';var slotId = 'div-gpt-ad-physicsteacher_in-box-3-0';var ffid = 1;var alS = 1002 % 1000;var container = document.getElementById(slotId);var ins = document.createElement('ins'); ins.id = slotId + '-asloaded'; ins.className = 'adsbygoogle ezasloaded'; ins.dataset.adClient = pid; ins.dataset.adChannel = cid;ins.style.display = 'block';ins.style.minWidth = container.attributes.ezaw.value + 'px';ins.style.width = '100%';ins.style.height = container.attributes.ezah.value + 'px';container.style.maxHeight = container.style.minHeight + 'px';container.style.maxWidth = container.style.minWidth + 'px';container.appendChild(ins);(adsbygoogle = window.adsbygoogle ).push();window.ezoSTPixelAdd(slotId, 'stat_source_id', 44);window.ezoSTPixelAdd(slotId, 'adsensetype', 1);var lo = new MutationObserver(window.ezaslEvent); lo.observe(document.getElementById(slotId + '-asloaded'), attributes: true );In one of our previous posts, we have discussed how the 8085 reads from and writes into memory. But we know that, unlike microcontrollers that have a certain amount of built-in memory, microprocessors do not have their own memory except for a few registers. So we need to attach external memory chips.
An 8085 microprocessor has a 16-bit address bus (A0-A15). Each bit can take the value of either 0 or 1. So, the total number of addresses that can be generated on a 16-bit address bus will be 65,536. And each unique address refers to a memory block containing 8 bits or 1 byte of space.
So a maximum of 64KB (=216 Bytes) of memory locations can be interfaced with it. The memory address space of the 8085 (i.e., the range of memory addresses that can be addressed by the 8085) takes values from 0000H (A0-A15, all bits are zero) to FFFFH (A0-A15, all bits are one) when represented in hexadecimal form.if(typeof ez_ad_units != 'undefined')ez_ad_units.push([[300,250],'physicsteacher_in-box-4','ezslot_5',148,'0','0']);__ez_fad_position('div-gpt-ad-physicsteacher_in-box-4-0');
if(typeof ez_ad_units != 'undefined')ez_ad_units.push([[250,250],'physicsteacher_in-leader-2','ezslot_11',174,'0','0']);__ez_fad_position('div-gpt-ad-physicsteacher_in-leader-2-0');The figure below shows the interfacing of these RAM chips with the 8085.
There are eight lines comprising the data bus of both 8085 and the memory chips. The interfacing of the data bus is the simplest part. We just connect corresponding lines (D0-D7 from 8085) to the corresponding pins (D0-D7 of the memory chip).
Similar to the previous case, we connect the first 11 address lines of the 8085 microprocessor to the 11 address lines of the 2kB RAM. These bits will take values of 0 and 1 and will generate 2 * 1024 different addresses. The address bits A10-A0 will vary from 000 0000 0000 to 111 1111 1111.
The 8085 (eight zero eight five) microprocessor is an 8-bit microprocessor. It is developed by Intel using NMOS technology and introduced in 1976, March. The 8085 is the version of 8080 microprocessor were added to the interrupt and serial input/output features.
The 8085 microprocessor has an 8-bit data width and 16-bit address width. This microprocessor has 60 pins. This is used for many electronic devices like oven, mobiles, etc.
The 8086 microprocessor is a 16-bit microprocessor. It is a developer by Intel and it is an advanced version of 8085. This processor has a 16-bit data width, a 20-bit address width, and 1MB memory storage. It provides a powerful instruction set. Using 8086 microprocessor make some operation like multiplication and division and so on easily.
The microprocessor connects with many internal and external devices to process the task successfully. This procedure called interfacing in a microprocessor. In the microprocessor has i/o interfacing and memory interfacing. The connectivity of input devices (keyboard) and output devices (screen) with a microprocessor called I/O interfacing. The microprocessor accesses the memory to read the instruction code and store the data called memory interface.
IO Interfacing indicates the various communication devices like the keyboard, mouse, printer, etc. When we need to interface the keyboard and other devices with the microprocessor by using latches and buffers. This type of interfacing is known as I/O interfacing.
The 16-bit microprocessor has a 16-bit data width, 20-bit address width, and 1MB memory storage. This has a powerful instruction set to do many operations. 8086 is an example of a 16-bit microprocessor.
The data bus is bidirectional and carries the data and information. This data flow both direction which means from memory/devices to microprocessor and from microprocessor to memory or input/output devices. The data bus either 8bit or 16 bit.
The memory mapping is used to transfer the logical address space into physical memory but sometimes physical memory is a smaller size. The microprocessor can access external memory. The memory mapping used for increased access to physical memory. 350c69d7ab