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It is used with many microprocessors and microcontrollers for various purposes. The device has three 8-bit ports port A, port B and port C. These ports can be used as input or output. These ports are further divided in to two groups A and B. 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<div></div> <div class="paragraph" style="text-align: justify;"><span style="color: #2a2a2a;"><span style="font-size: medium;">8255 is general purpose programmable peripheral interface. It is used with many microprocessors and microcontrollers for various purposes. The device has three 8-bit ports port A, port B and port C. These ports can be used as input or output. These ports are further divided in to two groups A and B. Each group further has ports. Group A is comprised of port A and port C upper nibbles (pins 7, 6, 5, 4) control. Group B contains port B and port C lower nibble( 0, 1, 2, 3).</span></span></div> <div> <div class="wsite-multicol"> <div class="wsite-multicol-table-wrap" style="margin: 0 -15px;"> <table class="wsite-multicol-table"> <tbody class="wsite-multicol-tbody"> <tr class="wsite-multicol-tr"> <td class="wsite-multicol-col" style="width: 41.891891891892%; padding: 0 15px;"> <div> <div class="wsite-image wsite-image-border-none " style="padding-top: 5px; padding-bottom: 10px; margin-left: 0px; margin-right: 10px; text-align: center;"> <p><a href="/wp-content/uploads/2/2/1/5/22159166/1575712_orig.jpg" rel="lightbox"> <img decoding="async" style="width: 329; max-width: 100%;" src="/wp-content/uploads/2/2/1/5/22159166/published/1575712.jpg?1567455947" alt="8255A Pinout and working" /> </a></p> <div style="display: block; font-size: 90%;">8255A Pinout</div> </div> </div> </td> <td class="wsite-multicol-col" style="width: 58.108108108108%; padding: 0 15px;"> <div> <div id="318390740696917166" class="wcustomhtml" style="width: 100%; overflow-y: hidden;" align="left"> <h3>8255 PPI pin out</h3> </div> </div> <div class="paragraph"> <ul> <li><span style="font-size: medium;">Vcc Apply 5 volts to this pin.</span></li> <li><span style="font-size: medium;">GND Ground this pin</span></li> <li><span style="font-size: medium;">CS (chip select) A low on this selects the 8255. Now you can use the chip. </span></li> <li><span style="font-size: medium;">RD (read) A low on this pin indicates that we want to read data from specified port of 8255.</span></li> <li><span style="font-size: medium;">WR (write) A low on this pin indicates that we want to write to 8255.</span></li> <li><span style="font-size: medium;">RESET A high on this pin clear all registers and ports.</span></li> </ul> </div> </td> </tr> </tbody> </table> </div> </div> </div> <div> <div class="wsite-multicol"> <div class="wsite-multicol-table-wrap" style="margin: 0 -15px;"> <table class="wsite-multicol-table"> <tbody class="wsite-multicol-tbody"> <tr class="wsite-multicol-tr"> <td class="wsite-multicol-col" style="width: 58.108108108108%; padding: 0 15px;"> <div class="paragraph" style="text-align: justify;"> <p><span style="font-size: large;"><strong>A0 and A1</strong></span><br /> <span style="color: #2a2a2a; font-size: medium;">These both pins select the ports. Combination of high and low level signal on these pins selects the ports A, B and C. Not only these pins are used to select port but also can write control word in device.</span></p> <p>Control Word is an instruction or command send to 8255 to set its ports or pins as input, output or interrupt driven.</p> </div> </td> <td class="wsite-multicol-col" style="width: 41.891891891892%; padding: 0 15px;"> <div> <div class="wsite-image wsite-image-border-none " style="padding-top: 10px; padding-bottom: 10px; margin-left: 0; margin-right: 0; text-align: center;"> <p><a href="/wp-content/uploads/2/2/1/5/22159166/393368_orig.jpg" rel="lightbox"> <img decoding="async" style="width: 338; max-width: 100%;" src="/wp-content/uploads/2/2/1/5/22159166/published/393368.jpg?1567455984" alt="8255A Port selection Pins--- A0 and A1" /> </a></p> <div style="display: block; font-size: 90%;">8255A Port selection Pins— A0 and A1</div> </div> </div> </td> </tr> </tbody> </table> </div> </div> </div> <div> <div id="163522168900506041" class="wcustomhtml" style="width: 100%; overflow-y: hidden;" align="left"> <h3>8255 Modes</h3> </div> </div> <div class="paragraph" style="text-align: justify;"> <p><span style="font-size: medium;">There are three modes in which the device can be used.</span></p> <ul> <li><span style="font-size: medium;">Mode-0</span></li> <li><span style="font-size: medium;">Mode-1</span></li> <li><span style="font-size: medium;">Mode-2</span></li> </ul> </div> <div> <div id="392390156923527107" class="wcustomhtml" style="width: 100%; overflow-y: hidden;" align="left"> <h3>8255 PPI in Mode-0</h3> </div> </div> <div class="paragraph" style="text-align: justify;"><span style="color: #2a2a2a; font-size: medium;">In mode 0 each group can be used as input or output. Port A , port B and port C can be used as input or output. Port C has the specialty that it can be divided in to two nibbles upper and lower. Both upper and lower can now be programmed to use as input or output. Mode 0 is also known as input/output mode (I/O mode). </span><span style="color: #2a2a2a; font-size: medium;">Question arises how we can do so. Yes it’s simple. Just send a control word to 8255 and it will set itself according to your control word. The control word for mode 0 is like this.</span></div> <div> <div class="wsite-image wsite-image-border-none " style="padding-top: 10px; padding-bottom: 10px; margin-left: 0; margin-right: 0; text-align: center;"> <p><a> <img decoding="async" style="width: 100%; max-width: 606px;" src="/wp-content/uploads/2/2/1/5/22159166/8903023_orig.png" alt="8255 control word" /> </a></p> <div style="display: block; font-size: 90%;">8255 control word</div> </div> </div> <div class="paragraph" style="text-align: left;"><span style="font-size: medium;">D7 will always be high for mode 0. For selecting all ports as output the control word will be 0x80 in hexadecimal, or 10000000 in binary.</span></div> <div> <div class="wsite-image wsite-image-border-none " style="padding-top: 10px; padding-bottom: 10px; margin-left: 0; margin-right: 0; text-align: center;"> <p><a href="/wp-content/uploads/2/2/1/5/22159166/5441859_orig.png" rel="lightbox"> <img decoding="async" style="width: 100%; max-width: 606px;" src="/wp-content/uploads/2/2/1/5/22159166/5441859_orig.png" alt="8255 control word" /> </a></p> <div style="display: block; font-size: 90%;">8255a control word</div> </div> </div> <div class="paragraph" style="text-align: left;"><span style="font-size: medium;">In mode 0 you can also access individual bits of port C. </span><span style="color: #2a2a2a;"><span style="font-size: medium;">For bit set reset mode D7 will always be 0.</span></span></div> <div> <div class="wsite-image wsite-image-border-none " style="padding-top: 10px; padding-bottom: 10px; margin-left: 0; margin-right: 0; text-align: center;"> <p><a href="/wp-content/uploads/2/2/1/5/22159166/5078911_orig.png" rel="lightbox"> <img decoding="async" style="width: 100%; max-width: 606px;" src="/wp-content/uploads/2/2/1/5/22159166/5078911_orig.png" alt="8255 control word" /> </a></p> <div style="display: block; font-size: 90%;">8255 control word</div> </div> </div> <div> <div id="482530235168256382" class="wcustomhtml" style="width: 100%; overflow-y: hidden;" align="left"> <h3>8255 PPI in Mode-1</h3> </div> </div> <div class="paragraph" style="text-align: justify;"><span style="font-size: medium;">In mode 1 each group can be used as 8-bit input or output data bus and the remaining 4-bits are used as handshaking and interrupt control signals. Port A is used with port c upper three bits and port B is used with port c lower 3 bits. The remaining 2 bits of port C can be used as control signals. </span><span style="font-size: medium;">For more details on mode 1 download the data sheet released from Intel from the links below.</span></div> <div> <div id="123342766959784892" class="wcustomhtml" style="width: 100%; overflow-y: hidden;" align="left"> <h3>8255 Mode-2</h3> </div> </div> <div class="paragraph" style="text-align: justify;"><span style="color: #2a2a2a;"><span style="font-size: medium;">Mode 2 is a bidirectional bus mode it is used very rarely. Mode 2 is used with port A only and port C is used for interrupt and control signals only. For more details on mode 1 download the data sheet released from Intel from the links below.</span></span></div> <div> <div id="193039684544436161" class="wcustomhtml" style="width: 100%; overflow-y: hidden;" align="left"> <h2>Microcontroller Projects Related to 8255A. Practical Examples with Code.</h2> </div> </div> <div class="paragraph" style="text-align: left;"> <ul> <li><span style="font-size: medium;"><a href="/increasing-digital-io-of-arduino.html">Increasing digital Input/Output Pins of Arduino Uno using 8255A.</a></span></li> <li><a href="/leds-with-8255-and-8051-microcontroller.html"><span style="font-size: medium;">Interfacing 8255A with 89c51 microcontroller and Blinking Leds.</span></a></li> </ul> </div> <div class="paragraph" style="text-align: right;"><a href="/wp-content/uploads/2/2/1/5/22159166/8255.pdf" target="_blank" rel="noopener noreferrer"><span style="font-size: medium;">Download</span></a></div> </div> </div> <hr><span class="entry-categories">Filed Under: <a href="https://www.engineersgarage.com/electronic-projects/pic-microcontroller-electronic-projects/" rel="category tag">PIC Microcontroller</a></span><br /><span class="entry-tags">Tagged With: <a href="https://www.engineersgarage.com/tag/8255a/" rel="tag">8255A</a>, <a href="https://www.engineersgarage.com/tag/operating-modes/" rel="tag">operating modes</a>, <a href="https://www.engineersgarage.com/tag/pinout/" rel="tag">pinout</a></span><br /> <hr><hr /> <nav class="navigation post-navigation" aria-label="Next Article"> <h2 class="screen-reader-text">Next Article</h2> <div class="nav-links"><div class="nav-previous"><a href="https://www.engineersgarage.com/schottky-diode-construction-working-applications-specifications/" rel="prev">← Previous Article</a></div><div class="nav-next"><a href="https://www.engineersgarage.com/new-snapdragon-x70-modem-rf-offers-worlds-first-5g-ai-processor/" rel="next">Next Article →</a></div></div> </nav><hr /></div><footer class="entry-footer"></footer></article> <div id="respond" class="comment-respond"> <h3 id="reply-title" class="comment-reply-title"><span style="font-size:16px">Questions related to this article?<br />👉Ask and discuss on <a href="https://edaboard.com?utm_source=EG&utm_medium=link&utm_campaign=TellUsWhatYouThink&utm_content=article60121&utm_term=forum" target="_blank" rel="nofollow noopener" style="color:red">EDAboard.com</a> and <a href="https://electro-tech-online.com?utm_source=EG&utm_medium=link&utm_campaign=TellUsWhatYouThink&utm_content=article60121&utm_term=forum" target="_blank" rel="nofollow noopener" style="color:red">Electro-Tech-Online.com</a> forums.</span><br /><br /><hr />Tell Us What You Think!! 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